Standard phone charger?

Why don't our governments force all mobile phone companies to use a single connector on their chargers, in order to eliminate the mountains of e-waste generated by switching chargers every time you switch phones. Transformer bricks with esoteric connectors are the most common form of electronic crap we see on street-vendors' blankets around the world (literally thousands and thousands of them in Mumbai's Chor Bazaar and street and box shops in Bangalore), and given that they all put out nearly the same voltage and amperage, it really does seem like pure waste.