Final answer:
In the context of climate change, a mitigation approach includes actions like planting more trees and implementing carbon capture technologies, which directly reduce or capture greenhouse gases.
Step-by-step explanation:
A mitigation approach to climate change involves strategies that reduce the release of greenhouse gases into the atmosphere or remove existing gases from it. Options such as planting more trees and implementing carbon capture technologies help to mitigate climate change by addressing the root cause: excess greenhouse gases. From the provided choices, both planting more trees (a) and implementing carbon capture technologies (c) are direct mitigation strategies. Other methods like developing drought-resistant crops can also contribute to mitigation indirectly by reducing the need for additional land and water resources, potentially reducing overall carbon emissions.
Notably, these strategies are keystones among a suite of proposed actions advocated by various government agencies like the US Environmental Protection Agency, which recommends alternative energy sources and energy conservation efforts as part of effective mitigation efforts.