A 3 degree increase would recreate the climate of the last epoch of the Tertiary period, the Pliocene, 3 million years ago. The northern hemisphere had no glaciers on its continents and sea levels were 25 metres higher. Warmer seas absorb more CO2.

On land huge amounts of carbon are stored in the soil, some estimated 1600 gigatonnes, more than double the entire carbon content of the atmosphere. As soil warms this stored carbon is released ino the atmosphere. A runaway positive feedback loop pours carbon into the atmsphere increasing concenrations by 250 parts per million by 2100, increasing global warming by another 1.5C

With new ‘'super-hurricanes' growing from the continually warming sea, Houston would be gone by 2045 and Australia uninhabitable. As the land burns the sea continues to rise, 80% of arctic sea ice will be gone.