It is very easy. I will explain to you. CO2 is reactive to infrared radiation. Infrared radiation is what transports the biggest amount of energy in the spectrum of solar radiation. Since CO2 reacts to infrared radiation, it increases the temperature on earth.

The temperature on earth is naturally tending to create equality of energy entering from space and energy exiting into space. When the amount of CO2 is increased in our atmosphere the absorbtion (storage) of energy within our atmosphere increases. To get a zero sum game again, the atmosphere needs to increase the temperature.

This has a massive effect on all species of earth. Species need to mass migrate, to find a space where they find their living conditions in 100 years. Many species do not have the natural ability to migrate in the pace of climate change we have now. Therefore they will extinct.

When enough species extinct, ecosystems loose their stability and they tend to collapse. We humain are part of such an ecosystem. We depend on flourishing soil, growing plants, healthy microorganisms and animals in order to survive. Climatechange is threatening this ecosystem of live.

Since I want to create better circumstances for my children, then the cirumstances I have, I want to increase stability of ecosystems. Not decrease them.