This is a fantastic layer.

Most people don't realize that in entire history of the Earth (~4.5 billion years), ice caps are actually the exception rather than the norm. Yes, I agree that we humans are creating an environmental disaster through the use of fossil fuels but I believe a lot of so called environmentalists are hurting our cause misquoting proven science making it harder for people to move forward. Especially when most people who are not familiar with science, like politicians and your average joe reading the newspaper hears all these dissenting sides of the argument with many clearly unscientific and easily disproven myths about global warming and the environment in general.

It would be interesting to see if we could make a layer that shows throughout the history of the Earth, the glaciation periods and warming periods kind of like a movie format.

source: geology/earth science classes at university.