Buy a Nest thermostat, get a free Google Home Mini at Walmart

June 5 is World Environment Day. We would have said "Happy World Environment Day," but record high levels of CO2 and yesterday's heart-stopping headlines about earth's 2050 demise don't make "happy" feel like the right term.

If we work fast, a collective lifestyle change from all of us can make a difference. Buying a reusable water bottle, getting a credit card from a company that gives back, and reducing your home's energy usage are great ways to start. Do the third one today: When you buy a Nest smart thermostat at Walmart, you'll get a free Google Home Mini (a value of $49).