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...out more about The Open University's Environment courses Feeding a hungry planet The global population is growing, with numbers projected to reach 9.7 billion by 2050. Such a population requires a large quantity of food, yet the current trend of continually expanding agricultural land is a significant driver of climate change, with agricultural emissions accounting for...

...infinitesimally short period of time that it’s impossible to remain in. However it turns out that the rate at which time flows forwards is not necessarily a fixed quantity. So, what about travelling into the future or the past – is that sort of real time travel possible? Well, the first of these is certainly possible, but as far as we know, the other is impossible to achieve. Time travel into the future is easy – in ......