At the same time, plants play the most important role, since they not only absorb CO2 but also produce oxygen, which is of great importance to people and animals. But if moss, shrubs, and other vegetation have the ability to absorb carbon dioxide, then trees, in addition, are also able to fully filter the air, purifying it of all harmful substances. Scientists even conducted an experiment, establishing that oak gall, bitter orange, lemon, and laurel filter the air quite well. The approximate "power" of one tree was also established: an adult plant can absorb up to 80 kilograms of CO2 per year! Seems like a big number, right? But cities with industrial plants manage to produce much more of this harmful gas. On average, human activity around the world creates 36 billion tons of CO2 per year, directly affecting climate change around the world.