Cheap energy goes a long way toward solving those problems. Many "rare" materials are only rare because they're energy intensive to extract, or they might not be needed at all (e.g. rare earth metals in motors and batteries) if we can afford to sacrifice energy efficiency in products. If we can irrigate all the deserts with desalinated sea water then there's less need for intensive agriculture. Pollution control technologies need energy to run and build, so cheaper energy means there's less opposition to using them.