Check this out: There are lots of speculations regarding Climate Change. Is it real? How bad will it be? What will the effects be? Etc.
The Earth could warm another 2 to 11.5°F this century if we fail to reduce emissions from burning fossil fuels and deforestation—devastating our livelihoods and the natural world we cherish. The Environmental Defense Fund has put together answers to much of this. It is well worth reading and may get you to do something. Think of getting on their email list.