What the OP said is not very clear. But I am not afraid of global warming and drought, just think about it, there is drought and drought all over the world.
At that time, because there is no water in the lands that will be of no use. Production will completely stop, I don't know if we will see this, maybe our children will witness such a time, I hope not.
Global warming is real thing and it's up to us whether we accept it or close our eyes on this important matter. We might survive consequences of global warming but our coming generations have to bear that. It all didn't happened overnight, the planet earth has been constantly destroyed by humans in the name of industrial revolution. Already whether pattern has changed a lot, in my country (Pakistan) summer are getting intense and their duration is increasing while winter intensity and duration is decreasing. The climate change is real thing and it's best for us to accept it and take measures before it gets too late.