On Q1, don't perpetuate the myth that there is a safe level of emissions. This assumes we understand more than we do...
For 'safe' read the points about Greenland near the end. Maybe not in our generation or the next, but the current levels of CO2 in the atmosphere will eventually cause Greenland to melt. This would be dangerous, so the safe concept should be avoided.
Thermal Expansion Of The US
17 minutes ago