Forests both help prevent global climate change and are affected by changing temperatures. Firstly, forests act as a “sink” for carbon dioxide, a major greenhouse gas. When forests are burned or cleared, this CO2 goes back into the atmosphere. So we need our forests to keep our planet cool.
Secondly, forests have been affected by climate change. There has been some die-off of trees experiencing warmer temperatures, and in the Arctic there is a major problem with new tree eating pests which are able to move further and further into forests which used to be too cold for them.
To add to julia52′s answer, deforestation-by-fire increases CO2 levels in the atmosphere both by creating CO2 in the burning process, and by preventing the now-dead trees from absorbing CO2 in the future.
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