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![Swimmers brave the waters in the shadow of a coal-fired power plant. Coal plants like this one emit CO2 into our atmosphere which is warming the planet and altering the chemistry of the ocean.](/sites/default/files/styles/3_2_small/public/2023-11/IH208271_smokestack_corbis_intro_1.jpg.webp?itok=hGv2yfBV)
overview
Climate Change
Today, carbon dioxide (CO2) levels in our atmosphere are the highest they've been......![On average, Arctic sea ice has decreased by four percent per decade since the late 1970s.](/sites/default/files/styles/3_2_small/public/2023-11/ExtremeIce_IcelandDSC_0052_full_1.jpg.webp?itok=_oOwCQ_s)
overview
Sea Level Rise
The ocean never stops moving. When you visit the beach, waves roll in and recede......![A shell placed in seawater with increased acidity slowly dissolves over 45 days.](/sites/default/files/styles/3_2_small/public/2023-11/PMEL_Feely_dissolving-shells_main_1.jpg.webp?itok=X5Vs7NSf)
overview
Ocean Acidification
Ocean acidification is sometimes called “climate change’s equally evil twin,”......![Close-up photograph of translucent coral polyps, showing the symbiotic algae living inside.](/sites/default/files/styles/3_2_small/public/2023-11/4_01_R01_G02-full_1.jpg.webp?itok=1qv0Skn_)
slideshow
Zooxanthellae and Coral Bleaching
Tiny plant-like organisms called zooxanthellae live in the tissues of many...![A bluefin trevally swims in Hawaii’s Maro Coral Reef, part of the Papahānaumokuākea Marine National Monument.](/sites/default/files/styles/3_2_small/public/2023-11/NWHI-full_1.JPG.webp?itok=Em09GF_n)
slideshow
Two Views of Coral Reefs: Thriving and Threatened
Coral reefs are beautiful, vibrant ecosystems that house roughly one quarter of...![Chrysaora melanaster is a jellyfish found in the Arctic.](/sites/default/files/styles/3_2_small/public/2023-11/Chrysaora_melanaster.jpg.webp?itok=Elat8aoy)
overview
Jellyfish and Comb Jellies
Jellyfish and comb jellies are gelatinous animals that drift through the ocean's......![An image from a drone of Majuro island](/sites/default/files/styles/3_2_large/public/2023-11/160926_MI_MajuroDE_45deg_0557.JPG.webp?itok=KdA3dwNL)
Article
Mapping Out What’s Next for the Marshall Islands
For residents of the Marshall Islands, a system of over a thousand islands found...
June 2018