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his week is a big one
for our world. Atmospheric carbon dioxide (CO2) levels climbed above the 400
parts per million (ppm) at the Mauna Loa Observatory and it’s distinctly
possible they won’t be back below that level again in our lifetimes.
Humans have burned enough fossil fuels to drive atmospheric
CO2 to levels that world hasn’t seen in at least 400,000 years. That’s driven
up temperatures, melted ice and caused oceans to acidify. Some extreme weather
events around the world have become more likely and stronger because of it, and
some will likely only get worse as the planet continues to warm.
Read the Climate
Central story - “What Passing a Key CO2 Mark Means to Climate Scientists.”
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