Typically you can pre-buy credits and then just download images when you need them.

只要在网站上预存了一定款项就可以下载你需要的图片。

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On Alibaba's Taobao shopping app, people can also buy groceries, buy credits for online games, scan coupons and find deals at stores nearby.

在阿里巴巴的淘宝购物应用中，人们可以购买食品杂货，买网络游戏卡，搜寻附近商铺的折扣。

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Over 70% of Facebook's users fall into that category, and having a globally-available payment system lowers the barriers for people to buy credits.

超过70%的Facebook用户都是美国以外的用户，而全球化的支付系统将降低他们购买虚拟货币的门槛。

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Such a technique would then allow utilities to spend money on the kinds of technologies needed to cut emissions, instead of having to buy credits.

FORBES: California's Carbon Caps are Contentious but Coming

The taxpayers who buy credits come out a little ahead.

FORBES: Magazine Article

Poor nations are divided about this - they want the US to buy credits from them, but they also want to ensure that America makes deeper cuts at home.

BBC: Climate chief's pledge on energy