Article+paragraphs

__Climate Change Threatens Many Tree Species__

The article tells how wind and climate change is killing off trees. I knew that weather could change the environment but I didn't know that climate change could kill off trees. It makes perfect sense. If some kinds of trees die off that would leave more CO2 in our planet. In turn this would give us less oxygen.

__Widespread, Persistent Oxygen-poor conditions in earth's ancient oceans impacted early evolution of animals__

This article was about how if there is suddenly more oxygen in the ocean some animals will not be able to survive. In any environment a large change can harm its balance. But I didn't know that to much oxygen is a bad thing. If the oxygen changes to much a lot of creatures will not survive. That could wipe out a lot of life.