350 Why 350? 
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And what does this 350 number even mean?
350 is the number that leading scientists say is the safe upper limit for carbon dioxide—measured in "parts per million" in our atmosphere. 350 PPM—it's the number humanity needs to get back to as soon as possible to avoid runaway climate change.
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Global Climate Crisis
So, what is global warming and what's the problem anyway? The science is clear: global warming is happening faster than ever and humans are responsible. Global warming is caused by releasing what are...
