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What Happens to Your Water Before the Coast Floods? · How To Protect The Ocean

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  What if climate change didn't flood your home tomorrow, but made your
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  drinking water undrinkable today?
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  This is the How to Protect the Ocean podcast, your weekday ocean news update.
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  If you care about staying informed about the ocean every single weekday, Monday to
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  Friday, hit that follow button right now on this podcast app that you're listening
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  to, so you don't miss tomorrow's story.
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  Today, we're answering one important question.
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  How is rising sea level quietly transforming life in coastal Bangladesh?
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  And why is this a warning for coastlines around the world?
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  Now, this episode is based off of a story I found on Mongabay News.
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  You can go to mongabay.com to find out more about this article.
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  I'll post the article in the show notes so you have access to it.
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  But today we're gonna be talking about sea level rise in a country that we
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  rarely talk about on this episode.
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  But Bangladesh is a very interesting country.
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  I've covered it on Beyond Jaws before with Dave Ebert where we talk
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  about shark fisheries in Bangladesh.
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  But today we're gonna be talking about coastal communities that are
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  getting more sea levels, getting more salt in their drinking water,
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  which is really difficult to imagine.
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  'Cause when people talk about sea level rise, they usually
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  imagine dramatic images.
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  Flooded streets, homes underwater, storm surges crashing over sea walls.
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  Those images are real, and they actually happen.
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  But they're not the first sign that the ocean is changing.
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  Sometimes the first sign is something much quieter.
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  You turn on the tap, the water tastes slightly salty.
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  Your crops stop growing.
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  Your family starts getting sick because fresh drinking water
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  is becoming harder to find.
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  That's the reality many people are living along the coast of Bangladesh today.
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  A new commentary published by Mongabay argues that saltwater intrusion
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  driven by rising seas and worsened by human activities is already
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  reshaping entire communities long before permanent flooding arrives.
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  This is not just a story that centers around Bangladesh.
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  Obviously, this is where the example is, and this is where the commentary comes
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  from, but this is really an ocean story because one of the biggest impacts of sea
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  level rise isn't the water we can see.
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  It's the water beneath our feet.
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  Bangladesh sits on one of the largest river deltas in the world.
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  Three major rivers, the Ganges, the Brahmaputra, and the Manga
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  empty into the Bay of Bengal.
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  For centuries, these rivers have carried fresh water and nutrient-rich
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  sediment that supports farming, fisheries, and millions of people.
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  But today, that balance is changing.
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  As sea level rise, saltwater is pushing farther inland,
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  pushing the freshwater back.
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  It doesn't simply just flood fields, it moves into rivers.
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  It seeps into groundwater.
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  It contaminates ponds and wells that families have relied on for generations.
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  The result is something called saltwater intrusion, and it's
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  exactly what it sounds like.
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  Saltwater moves into places where freshwater used to exist.
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  I've covered an article where the saltwater intrusion is happening
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  in Florida, where we're starting to see flooding that's happening not
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  only on top of the land, but in the groundwater and underneath the land.
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  So when floods happen, it actually comes from the soil first and goes through the
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  pores of the soil and up onto the land.
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  Once that happens, drinking water becomes scarce.
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  Agricultural soils become less productive.
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  Even trees and freshwater wetlands begin to struggle.
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  The commentary points out that sea level rise is only part of the problem.
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  Reduced river flow, upstream water management, coastal development, shrimp
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  farming, and stronger cyclones all make it easier for saltwater to move inland.
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  Just think about, like, stronger cyclones pushing that water further
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  and further inland into groundwater and allowing that saltwater to stay there.
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  So in other words, it's not just one single issue.
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  It's several pressures combining into a growing crisis.
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  And because the changes happen gradually, they often receive far less
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  attention than floods or hurricanes.
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  And here's why this story deserves even more of our attention.
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  Fresh water is one of the most basic resources any community needs.
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  Without it, everything becomes harder: growing food, raising livestock,
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  running businesses, maintaining just public health in general.
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  When fresh water becomes salty, families often have to travel
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  further to collect clean water.
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  Now, if you think about it, like I remember going back to my elementary
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  school days, even my high school days.
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  You know, in Canada, we talk about fresh water.
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  We hold twenty percent of the world's fresh water, and we share
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  that with the US through a border.
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  And I remember, especially with the amount of fresh water lakes that we
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  have in Canada too, like we have a lot.
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  And I remember a teacher telling me one day that that's gonna become
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  what wars are gonna be about.
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  It's gonna be about the very basic resource of fresh water
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  because fresh water powers what I just talked about everything.
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  And without fresh water, you just don't have healthy populations,
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  or you have to adapt to make sure that you have healthy populations.
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  And because the salt water's intruding, on our fresh water resources, we
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  are having more and more problems.
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  We have government bodies that are dedicated to making sure that our
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  source water for our drinking water is clean, not just from salt, but
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  from just chemicals and nitrates and ammonia and all these other
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  nutrients that are around in the water.
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  So just think about that.
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  Think about how important salt water has.
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  Like farmers may actually lose harvests because many of the
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  crops can't tolerate increased salinity in these Bengal regions.
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  Some communities switch from growing rice to farming shrimp because salt
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  water now dominates their landscape.
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  That may provide income for some people, but it actually changes
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  local ecosystems and food production.
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  There's another consequence we don't talk about either: migration.
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  When farmland becomes less productive and fresh water
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  disappears, people begin to leave.
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  Some move to nearby cities, others relocate farther inland.
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  Climate migration is often described as something that will happen in
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  the future, but many communities in Bangladesh, it's already happening.
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  We've seen it happen because of sea level rise on small island communities as well.
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  And this isn't unique to one country.
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  Saltwater intrusion is becoming a concern in coastal aquifers around
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  the world, including, like I said, Florida, like in the United States.
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  Recent research has found declining groundwater levels and increasing risk of
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  seawater contamination across many coastal regions from Asia to North America.
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  That's what makes Bangladesh such an important case study.
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  The country itself is experiencing one of the earliest and clear examples of
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  what a saltier future could look like.
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  So the question really is, like, is there anything that communities can do?
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  The answer is yes, believe it or not.
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  But there isn't just one single solution.
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  So protecting and restoring mangrove forests can help reduce storm surges
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  impacts and slow coastal erosion.
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  So just keeping the coast green essentially, like keeping it
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  natural, naturalizing coast.
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  I remember being at a
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  Coastal Zone Canada conference.
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  And it's a lot of engineers and a lot of people who are
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  doing things along the coast.
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  The one study that I was listening to was a study from an engineering
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  firm where they talked about how they were re-naturalizing the coastlines
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  along the Mississippi Delta.
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  And they were doing that because at one point they hardened those coastlines
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  because they were eroding away.
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  Some parts were eroding and some parts were building.
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  But what they didn't realize is that when something was eroding away, it
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  was building another coastline that was very, very important.
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  And when they hardened the coastline that was eroding away, there was
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  no other sand or dirt or sediment to build up the other coastlines.
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  And we started to lose other coastlines, changing, permanently changing the
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  shape of the Mississippi Delta, which affected a lot of indigenous people who
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  lived there and had their lands there and had their people, their ancestors
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  buried there for many, many, many, many years, like generations and generations.
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  So they went back to naturalizing those areas.
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  So, you know, a lot of times in Bangladesh and other places where you start to take
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  away mangrove forests for shrimp farming or coastal development, you start to
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  lose that security system, and that could stop sea level rise from actually
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  intruding and saltwater intrusion from actually happening at a better rate
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  than you would if you took it all away.
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  The biggest thing really, the point of this part here is that, you know, we need
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  to protect our coastal systems, right?
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  You also, need to look into, like, improving freshwater storage
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  systems, which allows communities to capture rainwater before
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  saltwater reaches local supplies.
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  Better groundwater management can reduce over-pumping, which makes
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  saltwater intrusion even worse.
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  Engineers are also exploring improved embankments, river
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  management, and nature-based solutions that work with coastal
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  ecosystems instead of against them.
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  And at the same time, the biggest driver remains global climate change.
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  The faster sea levels rise, the harder it becomes for communities
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  to stay ahead of the problem.
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  And that's why this story matters far beyond Bangladesh.
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  Whether you live in Florida, Atlantic Canada, the Netherlands, here in
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  Ontario, small island nations in the Pacific, or anywhere else along the
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  coast, the same process is unfolding.
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  The timing may be different, the severity may vary, but the physics are the same.
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  As oceans rise, saltwater moves inland, and once freshwater resources
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  become contaminated, recovering them may be extremely difficult.
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  One thing I appreciate about this Mongabay commentary is that it reminds
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  us climate change isn't only measured in centimeters of sea level rise.
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  It's measured in everyday decisions, like, "Can I drink this water?" Not
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  to say, "Hey, sea level's gonna rise one centimeter in the next generation
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  or the next, like, 50 years." That number doesn't equate to people.
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  But the fact is, like, can I drink this water, or can I grow food
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  here, or can my family even stay?
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  Those are the questions people are increasingly asking, and
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  they have to answer for them.
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  And those are the questions that most coastal communities
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  may face in the decades ahead.
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  So sea level rise isn't just about losing land.
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  It's about losing fresh water.
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  When the ocean changes, it's flowing beneath our feet.
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  It changes how people live, work, and survive.
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  The ocean is always a people story.
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  I want you to remember that.
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  The way we manage climate change, the way we conserve the ocean, is
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  we manage the people around it.
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  That's how we help not only the people who depend on it, but the
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  people who are affecting it as well.
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  That's the episode for today.
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  I would love to hear what you think.
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  You can hit me up my socials.
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  Links are in the show notes.
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  And of course, if you wanna support this podcast or the YouTube channel that I have
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  or any of the efforts that I have to make your ability to understand the ocean a
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  little bit better every single weekday, please feel free to support me on Patreon.
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  Go to speakupforblue.com/patreon.
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  That's speakupforblue.com/patreon to help support the show.
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  Thank you so much for joining me on today's episode of the How
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  to Protect the Ocean podcast.
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  Have a great day.
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  We'll talk to you next time, and happy conservation.