If you don’t have a lot of space ground source heating energy isn’t a good option. - The comma is missing after space., Solar panels can’t work at night, so they aren’t as productive as other types of renewable energy. - Correct., Hydropower is a very old idea so it’s reliable. - The conjunction is wrong. These ideas are not related by cause and effect. A better choice of conjunction would be and or but., Because wind turbines can be dangerous to birds, so many people don’t like them. - We can’t use because and so in the same sentence; choose one or the other., In the future, we will not have any more fossil fuels, but renewable energy will always be available. - Correct., Hydropower works 24/7 but it is expensive to build. - We need a comma before but., While wind turbines look beautiful to some people, they make a lot of noise. - Correct., Although climate change means there may be less rain in the future, hydropower won’t always work. - The conjunction is wrong. These ideas are not related by contrast. A better choice of conjunction would be because., Although solar power works in most parts of the world, takes up a lot of space. - The second clause is missing the subject: it., There isn’t always enough wind to move the turbines, and some people think they’re ugly. - Correct.,

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