A paleoclimatologist studying 2100 years of climate data collected from a lake in Indiana shows that a thousand years ago, North America had a few centuries of warm weather before succumbing to a drop in temperature and precipitation. here
Not all meteorologists or climatologists agree on what climate change data tells us. The founder of the Weather Channel strongly disagrees that the data indicates human impact on the climate. here
The National Snow and Ice Data Center measures the ebb and flow of ice formation around the globe, and describes the changes to our climate here and here. Sea ice continues to retreat in Antarctica, but is growing in the Arctic.