An analysis of the policy documents outlining the practical measures of the Green Deal shows that it will decrease carbon emissions in Europe, but also increase carbon emissions outside the EU. This increase is more than double the amount of carbon emissions saved by the Green Deal.

Their conclusion is that the Green Deal in its current form will lead to an increase of 244.8% in emissions in countries outside the EU compared to the Green Deal's carbon reduction goal in the land, land use change, and forestry sector within EU borders.

3billion trees sounds like a lot, but the area it takes to plant those trees is less the 1/1000 of the area of the EU. I highly doubt, that this would lead to a measurable decline in EU farm land and especially high quality farm land.

Frankly a highly speculative set of conclusions. Despite the green deal forbidding converting woodland to crops, the author assumes the opposite. Then they basically ignore the organic requirement. The idea that EU will wholesale move their food production (likely the strictest in the world) to Africa is so outlandish as to not be taken seriously.