We’ve all been there: the excitement of getting a new smartphone, the fun of loading it up with your favorite apps, and then the frustration when your handset starts getting weighed-down and your battery runs flat. DU Battery Saver and DU Speed Booster, products from China’s biggest search engine company Baidu, admittedly can’t satiate your upgrade lust for the latest Android flagship. Instead, they promise something perhaps even more useful: the ability to squeeze more performance out of your existing phone and postpone the need to buy a new one. But for the app developers, those benefits are secondary to an even more ambitious goal: helping the environment. If you’re upgrading your phone less frequently, you’re reducing your e-waste footprint and energy usage and putting less strain on the planet.