Directions: In the following passage, some words have been deleted. Select the most appropriate option to fill in each blank.

Climate change mitigation consists of actions to ___(1)___ global warming and its related effects. Climate change is mostly caused by the greenhouse gases that are ___(2)___ when burning coal, oil, and gas. Fossil fuel use can be ___(3)___ through energy conservation and by switching to clean energy sources. Wind power and solar photovoltaics (PV) are increasingly becoming cheaper than fossil fuels, though these ___(4)___ energy storage and improved electrical grids. As low-emission energy is ___(5)___ at a large scale, transport and heating can shift to these mostly electric sources.