The data set that allows us to make increasingly reliable predictions on the impacts and causes of climate change go back further than 40 years. Ice core analysis let’s us see hundreds of thousands of years into the Earth’s past climate.
Also, Homo Sapiens have been around for 200k years.
If you want to drive renewables, the US military machine are not going to do that for you. Private investment, coupled with government support and global collaboration will be the only way forward.
Start by reading this https://climate.nasa.gov/evidence/