Waves contain something called mechanical energy, mechanical energy is the energy due to the movement or position (or both) of the wave. This can then be converted into electrical energy (using something called a power-take-off system) which can be stored or connected to the grid for use. A tsunami would contain a lot of energy because of its size and velocity (the amount of energy is how big, fast and far the tsunami has travelled). Unfortunately, we are not able to harness (at the moment) the energy from a tsunami because of how big they are. When the waves become too big the wave energy devices must be put into something called survival mode. Otherwise, the devices in the sea could break and stop working, which we do not want to happen. For the last question, I am not 100% certain if you mean the effect of wave energy or tsunamis on humans, so I’ll explain both. First the effect of wave energy on humans. Wave energy is a form of renewable energy, with wave energy we would be able to reduce our dependence on fossil fuels. By reducing our use of fossil fuels for electricity generation we would be reducing our carbon emissions which is bad for the environment. The carbon emissions are leading to the climate change that I’m sure you’re hearing about all the time. The effect of tsunamis now can be devastating to the human population. But there has been a lot of research done (and still ongoing) for people to be prepared for these events.
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