The land we use to farm is limited, Earth isn't growing. Human population however is still growing. So, there are at least two choices.
1. Increase productivity of available land (that means pesticides, GMO, etc.)
2. Destroy some more forests/other ecosystems and replace them with farms.
Second is obviously damaging Earth. First is possibly damaging Earth and possibly damaging us.
If we proceed doing 2 sooner or later everything will be farming lands, so we will have to fallback to option 1.
So, it is better we go with option 1, as we will have to use it in the future anyway. More time and investments means less possible damage in the future as we will learn from mistakes we now make.
There is 3rd option here. Keep organic production and reduce population of Earth. You see that option is not going to be very popular.