Every single day, over 100 disposable pens are tossed in the trash. One way to help stop waste is to invest in a high-quality refillable pen. But many of those pens can be really expensive and difficult to refill. Instead, look for the seven-year pen. Its design marries the convenience and price of a disposable pen with the eco-attributes of a refillable pen. The big difference between it and a disposable pen? The seven-year pen hides a jumbo ink cartridge inside a highly durable pen casing, and it can write up to 1.7 meters of penmanship a day. That equals a lifespan of seven years.

If you're interested in helping big cats like lions and leopards, one way you can help is to fund the building of "bomas" in African villages. A boma is a fenced-in area that protects and maintains livestock. It's a barrier between the big cats and cattle, and it discourages locals from retaliating against lions who kill cattle. For $500 -- and $25 a year to maintain -- you can increase the safety of big cats. Learn more at buildaboma.org.

When looking at cleaning supplies and insecticides, there are three key words that can help you determine exactly how toxic the product is: "caution," "warning" and "danger." If you see "caution," it means the overall product ingredients are low in toxicity. "Warning" is a step up in toxicity. And if you see "danger," the product contains the highest level of chemicals and is considered extremely toxic. While it may not be possible to find completely organic and non-toxic products, you can look for those that say "caution" for your safest and greenest bet.