GEOLOGY

Detailed explanation-1: -Dropping the 1.5C limit for a higher one would dramatically increase the risks of food and water shortages, conflict, deadly extreme weather and other crises, Rockström and other scientists have said, and likely push the world past dangerous tipping points from which there is no possibility of return.

Detailed explanation-2: -If we reduce CO2 amounts to stop increasing after 2050, global average temperature will increase from 1-1.5°C, and this is considered a best case scenario (blue line in graph). If we don’t reduce CO2 and the amounts continue to increase, the worst case scenario warming will be 4.5-5°C (red line in graph).

Detailed explanation-3: -Results from a wide range of climate model simulations suggest that our planet’s average temperature could be between 2 and 9.7°F (1.1 to 5.4°C) warmer in 2100 than it is today. The main reason for this temperature increase is carbon dioxide and other heat-trapping “greenhouse” gases that human activities produce.

Detailed explanation-4: -Since 1880, average global temperatures have increased by about 1 degrees Celsius (1.7° degrees Fahrenheit). Global temperature is projected to warm by about 1.5 degrees Celsius (2.7° degrees Fahrenheit) by 2050 and 2-4 degrees Celsius (3.6-7.2 degrees Fahrenheit) by 2100.