Earth Day is turning 40 this year. To celebrate, many businesses are offering consumers free stuff, chances to win valuable prizes, and some good deals. Here's a sampling of Earth Day freebies: Gain free admission into all 392 U.S. national parks now through Sunday, April 25. Evos is giving away free organic milkshakes served in biodegradable cups on Earth Day. The healthy fast-food chain … [Read more...]