Obviously over-fishing and pollution will always be a problem. The solution lies in limiting activities that harm the ocean even though the problem will never be completely eliminated. Certain fishing techniques are devastating to marine environments and often unnecessary. Blasting is an example. This technique involves bombs that are detonated at sea in the hopes that the fish killed float to the surface for easy collection. Bottom trawling(拖网捕鱼)destroys massive amounts of deep sea ecosystems, killing the habitats of the animals they are fishing for. It is fishing practices like these that need improvement.
Controlling the amount of gases released into the atmosphere poses a more difficult problem. The good news is that there is a potential solution. Two effective techniques for limiting CO2 emissions would be, to replace fossil fuels with energy sources that do not emit CO2, and to use fossil fuels more efficiently. Alternative energy sources that do not emit CO2 include the wind, sunlight, nuclear energy, and underground steam. Devices known as wind turbines can convert wind energy to electric energy. Solar cells can convert sunlight to electric energy, and various devices can convert solar energy to useful heat. Geothermal power plants convert energy in underground steam to electric energy.
Fossil fuels are a limited resource as it is and research is currently underway in the hopes of finding alternative fuel sources. Until research comes up with less expensive alternative fuels, fossil fuels will continue to be used as the worlds primary energy source.
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