Geoengineering is a term that refers to technology that can alter Earth's natural cycles to cool down the planet.
Putting mirrors in space, capturing carbon dioxide, and seeding clouds with particles are all ways of manipulating weather or the atmosphere.
But some scientists and politicians think geoengineering could damage the planet or lead to war.
Read More: Longshot presidential candidate Andrew Yang thinks rogue geoengineering could cause a war But other experts are less than convinced that these planet hacks are a good idea.
What's more, McKibben said, geoengineering does little to address other problems that arise from greenhouse-gas emissions, such as ocean acidification.