If it got warm enough all water could evaporate into the sky into clouds

For example, 1 million years ago the average temperature at the North Pole was 76 degrees Fahrenheit.

If that were true now what would the average temperature be around the equator.

Scientists say that it took 1 million years of mostly ferns soaking up the Carbon dioxide (which they are really good at by the way) to reduce the Carbon dioxide to what it was the last 1000 years ago until now.

So, if  we plant a lot of ferns maybe they will reduce the carbon dioxide slowly too this time?

I have written recently how the amount of water that the air can contain rises significantly with the temperature up to 5 times the rain and snow fall at higher temperatures. Of course this likely wouldn't affect snow fall (unless it is warmer where the water evaporates before it moves over colder air and land and begins to snow) I'm thinking. However, as it moves over colder air and land the air temperatures would be lower so the moisture (as rain or snow) would have to fall out of the clouds at a greater rate than normal? 

By the way I'm not a weather man or weather woman so I'm just using basic practical logic here about all this.