Question

Assume that it has been discovered that the Earth's solar radiation is rapidly decreasing and will only emit 80% of the energy it emits today in 100 years. What might we as a planet do to prepare for this eventuality and/or offset the effects of this decrease in solar radiation?

Answer 1

The earth can radiate back to space only as much energy as it absorbs from incoming solar radiation. The Earth re - radiate its energy because the molecules which can absorb a radiation of particular wavelength can also re - radiate that wavelength.  And this happens for each and every molecule or atoms in this universe .  If due to any reason the earth will emit only 80% of the energy it emits today then it will cause very disastrous warming up of atmosphere (Global warming). And if we want to offset this condition then we will have to return back those remaining 20 % to the space. According to me

we can reflect back maximum radiation coming from the Sun using large amount of mirror like structure.

or we can paint a big area of Earth by white colour because white colour reflects maximum of energy (theoretically 100 %) incident on it.

Plantation is always a good option for reducing effect of global warming.

Or we should make our way to other planets because in that case Earth will not remain sustainable for life.

I think on this topic you should take suggestions from other persons too.

And Thank you.