Climate change is real and the consequences are catastrophic. The evidences are best presented at climate.nasa.gov/evidence and the impacts are summarized at https://www.ipcc.ch/sr15. Mitigating climate change is an uphill battle and we have to do everything we can to prevent the worst outcome.
On average it takes ~1800 strokes to plant one tree. In the Super Simple Draw app you can tap on the menu (•••) icon and estimate how many trees you contributed to with all your drawings.