A new United Nations science report is saying climate change is about to get much worse. It's likely going to make the world sicker, hungrier, poorer, gloomier, and much more dangerous within the next 18-20 years.

"The cumulative scientific evidence is unequivocal: Climate change is a threat to human well-being and planetary health," says the major report.

Today's children who will be alive in the year 2100 are most likely going to experience up to four times more climate extremes than now, even with a few more tenths of a degree of warming over today's heat. In addition to that,  if temperatures increase two more degrees Celsius from now (3.4 degrees Fahrenheit), they will feel over five times the floods, storms, drought, and heatwaves, according to the collection of scientists at the IPCC.

Currently, 3.3 billion people's daily lives are highly vulnerable to climate change and more people are going to die each year from heat waves, extreme weather, diseases, and air pollution, all because of global warming, the report says.