Today is the 40th anniversary of Earth Day, a time to highlight and discuss ways to work toward a cleaner planet. Cato’s energy and environment research promotes policies that would help protect the environment without sacrificing economic liberty, goals that are mutually supporting, not mutually exclusive.

• Why we should thank capitalism for environmental gains: “It is businessmen — not bureaucrats or environmental activists — who deserve most of the credit for the environmental gains over the past century and who represent the best hope for a Greener tomorrow.”

• Finding the right balance: “Today, America’s environment is cleaner—and Earth Day has indeed helped ensure that. …We should renew our promise to keep the environment clean—without adding to human misery or stalling improvements in the human condition.”

• Want clean air? Try this.

• Is high-speed rail really an environmentally friendly alternative to driving and air travel? “Planners have predicted that a proposed line in Florida would use more energy and emit more of some pollutants than all of the cars it would take off the road.”