Networking-equipment maker Cisco forecasts in its Visual Networking Index that the number of people using the Internet will climb from 3.3 billion today to 4.6 billion within four years. That would be more than half the world's population, using the United Nations' estimate of 7.8 billion by 2021.

网络设备制造商思科公司的视觉网络指数预测，4年内互联网用户将从现在的33亿人攀升至46亿人。联合国预估2021年全球人口为78亿，基于这一数字，届时互联网用户将占世界人口的一半以上。

Cheap solar power

廉价太阳能

Clean energy has been getting cheaper for a while now, and in the not-so-distant future of 2021, it is expected to finally become cheaper to use renewable power sources like solar and wind rather than coal in a number of key countries.

现在，清洁能源的价格已经越来越便宜，而在不久之后的2021年，在一些主要国家，太阳能和风能等可再生能源的价格有望低于煤炭。

While solar power—which is pricier than the other big renewable source, wind—is already comparable price-wise to coal in countries such as the US, Italy, and Germany, a recent report from Bloomberg New Energy Finance predicts that by 2021, solar power will be cheaper than coal in China, India, Mexico, Brazil, and the UK.

太阳能比风能等其他大型可再生能源要昂贵，虽然在美国、意大利、德国等国家，太阳能的价格已经比煤矿更合理，但彭博新能源财经近日的一份报告预测，到2021年，中国、印度、墨西哥、巴西和英国的太阳能将比煤矿更便宜。

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