Think globally, act locally, respond personally.
Responding personally includes feeling, thinking and doing. It includes actively thinking about the problems, reflecting on your own emotional response to climate change, facing your deep fears, understanding fully the threat that climate change and other environmental threats poses to yourself, the future, and the planet, and deciding that these threats are real and worth acting on.
Then, of course, are the actions. These include important lifestyle commitments that people can undertake, like transport choices, energy efficiency, food choices, resource use, conservation activities, environmental activism. When you make pro-sustainable behaviour choices you are helping to establish important norms, signalling your values to others, and becoming a more credible advocate for environmental issues.