Do you know that rechargeable batteries exist? If not, then now you know. It's just like an ordiary AA or AAA or any other small batteries that you always see with brands like Energizer, Philips and etc. The good thing about rechargeable batteries are that it's earth-friendly and cheaper. You'll just have to charge it when it's lowbat instead of throwing it. So yes, it's earth-friendly. FYI, batteries must be thrown in a proper place (in case you are using the ordinary one). The components within are very dangerous to nature that's why, be careful and pay attention when throwing it. Better to carry it in the store where you bought it because they have a special container for all the batteries. If I were you, I'd rather use rechargeable batteries.