Global Warming (read this and thought of Red)

The crops don't lie about climate change, they react.

 

That is exactly what is happening. The difference is that naturally occurring cycles happen very slowly in geologic time, while anthropogenic global warming is happening very quickly.

 

Get a wide range of opinions and be sure to check the sources. There are a lot of blog sites that simply lie about AGW and offer no scientific basis for their claims. The best ones will cite the sources and those sources will be peer-reviewed scientific journals, not popular articles which are all over the map in terms of accuracy and reliability.

Climate Change | U.S. EPA

IPCC - Intergovernmental Panel on Climate Change

Climate Change: Vital Signs of the Planet - NASA

Global Warming -- National Geographic

This is a complex calculation dependent on much data we cannot know, such as how fast humans can adapt to changing conditions. Warming is happening too fast for us to adapt by evolution, so it will have to be a technological adaptation and possibly too expensive to consider.

But studies indicate that vast portions of the planet could be uninhabitable in 300 years.

Earth may be too hot for humans by 2300: study - Environment - The Independent

 

Just because you don't understand a phenomenon, doesn't mean that nobody does.