I think it's agriculture.
Global warming is affecting all parts of the world today.(ex: drought, Heavy snow and rain, reduction of sea ice, sea level rise, etc.)
There is still a shortage of food in Africa. I think it's going to get worse. That's why I think it's agriculture.
What do you think?
I do not think it will be agriculture simply because your argument is based in Global warming in which case agriculture on it self won't survive because the conditions won't be there. This is why I think the next big industries would be computing and genetics.