D.how to arrange our foods every day
E
The concept of solar power satellites, or SPS, first put forward in the 1960s, is still not widely known by the general public. For example, at many public exhibitions about energy, SPS is not even mentioned. This is mainly because very little money has been spent on SPS research.
There are people who claim that SPS is unrealistic— because launch costs are much too high today; or because it is too far away.
So why do we believe that it is important to continue to do researches on SPS? The reason is very simple.
Humans are going to need huge amounts of electric power in coming decades.
Within 50 years the world population is expected to double,
while economic growth will continue around the world,
especially in the poorer countries.
But existing energy sources already face serious problems. They are limited; they are polluted; they are dangerous. So 50 or 100 years from now, where is our power going to come from? Nobody knows. So we believe that new largescale possibilities should be studied further.
We must remember that humans have some
choices concerning our future.
To some extent we can choose the direction in which our civilization develops. And choices that are made in the coming decadessuch as the energy sources that we will or will not use,
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