we are going to have a big energy problem in the future. Today, the world uses 320 billion kilowatt-hours of energy a day.
By 2100, we will use three times as much energy. How will we get the energy? Today,oil, and natural gas. But fossil fuels: coal, dirty and they will not last forever. In the long term, we will have to find alternatives. We will need renewable energy.
solar power
Near Leipzig in Germany, there is a field with 33,500 solar panels. It produces enough energy for 1,800 homes. That's a lot of energy! However. there are problems. One problem is that solar energy is expensive, but the price is falling "Thirty years ago it was cost-effective in satellites," says Daniel Shugar, president of PowerLifht houses and businesses." He says that in the future most houses will have solar panels. There are other problems with solar power. It needs a lot of space, and of course, it doesn't work at night