Humans will have travelled to Mars.
We will have used up all the fossil fuels.
Robots will have been invented to do all the work.
The world’s population will have doubled.
Doctors will have discovered a cure for cancer.
Scientists will have found new resources of energy.
Flying cars will have been used by everybody.
Temperatures will have risen by several degrees.
Intelligent houses will have been built for all people.
Oceans will have been populated by humans.