Every year, hundreds of millions of tons of CO2 are emitted into the atmosphere by human activity (farming, manufacturing, etc.). According to scientist Hugh Ross, this activity contributes to the cyclical change in earth's climate which he believes will eventually bring about a new ice age.
Countries get together and tell each other how they're trying to reduce their CO2 emissions. This year the U.S. president was disappointed that Russia and China "basically didn’t show up in terms of any commitments to deal with climate change."
Here's a chart showing how 20 different countries did from 2010 to 2020: the ten countries which reduced their CO2 emissions the most, and the ten countries which increased them the most. (Multiply the numbers by a million to get the actual number of tons reduced or increased in each country.)
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