Ozone Inc.

You run Ozone Inc. Your goal: warm the Earth to +20 degrees C.

Without greenhouse gases, Earth would be about degrees C

With them, it is about degrees C

Game over

At about +7 degrees C, extreme combinations of heat and humidity could exceed the human survival limit in some regions. At about +11 to +12 degrees C, those conditions could affect most of the population where people live today.

Source: Sherwood and Huber (2010), "An adaptability limit to climate change due to heat stress," Proceedings of the National Academy of Sciences.