Bob was studying about Earth's atmosphere. He found that increased depletion of Earth's ozone layer is a relatively new phenomenon. Most scientists would blame the CFC gases for the depletion of ozone layer. In the early twentieth century ozone layer was relatively stable. Bob labeled that time as time A. But in the late twentieth century situation changed with seasonal depletion of ozone layer. He labeled that time as time B. Which time would more likely see reduced marine primary productivity, time A or time B?
Ans: time B

Tree city and Leaf city were the two biggest cities in Boulderland. Tree city burned lots of gas and other fossil fuels, while Leaf city was very protective towards its environment. Which city exposed more people to asthma?
Ans: Tree

Two climate experts studied different continent to observe climate changes. Jordan studied Australia, while Jeb studied Antarctica. Which person didn't observe warming in winter?
Ans: Jordan

Two villages were focused mostly on mining operation. Brown village extracted fossil fuels such as coal from their mountains, while Yellow village was mostly focused on extracting gold the old fashioned way. Which village has less of an impact on global climate change?
Ans: Yellow