There are a number of people who argue climate change is not due to human activity. ____ that it is a result of a natural change in the Earth's climate. Alternative sources of energy can be costly and difficult to install. ____ may prevent certain countries from investing in them. There are many ways in which workplaces can become environmentally friendly. ____ they can switch off electronic devices and the lights at the end of the day. ____ dams are a useful method of creating clean energy, many people consider them ugly. The countries have discussed the problems of climate change, ____ they still have not come to an agreement.

Coherence

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