Avoid single-use items
Be more conscious of water usage and waste disposal
Choose food from local sources and eat seasonal produce as much as possible.
Raise awareness about the interconnectedness of the health of the planet and that of humanity.
Make changes institutionally at your parish, school or workplace
Support local efforts to solve environmental problems
Contact your Congress Members or Members of Parliament (advocacy)
Eat a meat-free meal at least once a week. Better yet, consider a flexitarian or vegetarian lifestyle.