Should the argument be is global warming/climate change man made and not does it exist?

[Mr. Wolf]

There is too much physical evidence that proves that global warming/climate change existed in the past and that it is happening now but people that make it a political issue say it is a hoax and does not exist.

 

[Ophelia]

I do not think there is consensus that the earth will defintively get warmer from here on out.

Why were the Vikings able to navigate crudely built ships into parts of Canada and North American that are mostly frozen now? Was it warmer for a period back then?