Europe had better potential than North Africa.
The farmland of North Africa is a lot more fertile than sometimes imagined
North Africa was the grain basket of the Roman Empire for centuries. One of the advantages was that you could harvest two crops in a year, due to the favourable climate, good soil and plentiful rainfall.
I don't know if you've seen Morocco, Algeria, Tunisia. I'd recommend it, if my personal experience is any guide. I have visited Morocco, which struck me as a very green and lush country. Arriving at Tangier, we travelled south through a landscape of lush green meadows filled with flowers and thick, tall grass.
Further south we encountered tall pine forests, full of trees with a dark green colour. It rained for several days. In the forest, we saw monkeys - they are found naturally in the wild.
Later on we drove up into the Atlas mountains, where the landscape was heavily forested with lakes. I'm told that heavy snowfall is common in winter, and ski resorts like Ifrane are well known.
Historical evidence shows that in the Roman period, groves of lemon trees were being grown even in the most arid country of North Africa, Libya (which is a long way east of where I was), in areas far inland.
While soil erosion, over-grazing, the Banu Hilal migration in the 11th century and global warming in the last century or so have all had some impact (especially in more marginal areas), North Africa is still a good deal greener than many outsiders would imagine.
I do wonder if the popular image of north Africa as a desert largely stems from the second world war, when the British army faced the Italians and later the German Afrika Korps. Commanders like Rommel were called "the desert fox", and so on. But that campaign was mostly fought in Libya and western Egypt, which are the most inhospitable desert regions.