Well, to keep things simple :

- CO2, as a greenhouse gas, increase the Earth surface temperature

- This temperature increase causes droughts/floods/other extreme meteorological events

- Lands that used to be arable aren't anymore, because of these events.

- People need to feed themselves, so they need new lands.

- They burn forests, wipe out ecosystems, and kill millions of animals in the process.

But that hasn't happened. These people did not lose land from "extreme meteorological events". They simply exhausted the stored fertility in the soil, and it is cheaper to burn another chunk of forest than it is to purchase fertilizer. A hypothetical scenario that could happen in the future does not explain the actual scenario that the article we're discussing is about.

False dilemma. Of course over exploiting arable lands contribute to this problem. But it does not mean it is the only cause.

You'll have a hard time in this world if you believe that every problem has a single source...