By 2050, human beings will have been <u>building</u> (build) and living in cities for around 10,000 years. It is estimated that, by this date, more than 70 percent of the world's population will be <u>living</u> (live) in urban environments. In preparation for this, developers in the US alone <u>have</u><u>constructed</u> (construct) nearly ninety million new homes by 2050. The cities of the future are likely to be much cleaner places than those we inhabit today. By then architects <u>will have designed</u> (design) buildings that use smart materials to help reduce air pollution and we <u>will use</u> (use) less fossil fuel and more alternative energy for decades, making cities considerably less polluted than they are today. Solar panels <u>will become</u> (become) the norm on most buildings by 2050, and we <u>will recycle</u> (recycle) a much larger proportion of our waste than we do today. Where will you be living in 2050? Wherever it is, it is very likely to be in a city
