Why are people worried about climate change?
a. it is unnatural it has never happened before on earth.
b. our planet will not be able to support life in 100 years
c. it is happening much faster than in the past, and plants and animals can't adopt quickly

The answer is C and the reason its happening so fast is because of the pollution 

When it comes to encouraging action against climate change, getting the public to care about the issue — or just believe it exists — is a primary preoccupation for scientists and activists. But it turns out that even people who are the most worried about the problem are often not taking much public action about it. 

It is evolution, because we all have some of the same traits like eye color or shape or ears.