Read the paragraph. Global warming resulting from greenhouse gases is a serious issue that demands immediate action. Throughout the world, we can already see the significant affects of global warming on people and natural habitats.

Pick the evidence that best supports the author’s claim?

A. Scientists have studied global warming for years, and they largely agree that the climate is changing. Scientists can drill core samples in Antarctic ice and study the carbon dioxide in these samples to see how greenhouse gases have risen in our atmosphere. They can also measure how quickly the ocean is rising year after year.

B. Unfortunately, many polls show that global warming is not a major concern among large portions of the population. Therefore, it is imperative that we work together to raise people’s consciousness of this important issue. If we work together, we can make global warming an issue that everyone cares about.

C. I’ve noticed that summers are warmer and longer. Trees in my neighborhood bloom two to three weeks earlier than they used to when I was growing up. Sometimes, we barely get any snow in winter, which means we can longer go skiing or sledding.

D. Many meteorologists suggest that the increased severity of hurricanes, tornadoes and drought is a direct result of global warming. Sea levels are increasing as polar ice caps melt. Towns in the arctic that were built on permafrost are sinking as the permafrost melts.