Now British scientists think they may have found the answer to increasing productivity again.
Scientists think it could reduce some of the risk of eating fish with still-climbing mercury levels.
Scientists think they have identified one key reason why ground-level ozone remains stubbornly high in Europe.
Scientists think the feathers may have evolved as insulation to keep the animal warm.
Some scientists think that the planet is already on an irreversible journey to dangerous warming.
Scientists think that black holes grow as small ones merge to form heavier objects.
The scientists think that faith-based thoughts may increase "self-monitoring" by evoking the idea of an all-knowing, omnipresent God.
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The Yangtze river dolphin made news because scientists think that it may now have been driven to extinction.
The scientists think the co-ordinated behaviour may be a strategy for avoiding predators rather than to corral the krill.
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Scientists think that the compound itself has an effect on limiting glucose absorption, which in turn helps reduce weight.
Some scientists think it's caused by an infectious agent, such as a virus.
From the data gathered by Curiosity's meteorological station, scientists think dust-devils may even have run over the mobile laboratory.
Scientists think the web became trapped in conifer resin after a forest fire and then became fossilised inside the resulting amber.
That is the level which would essentially mean the world warms another 2 degrees, what scientists think of as dangerous, he said.
Scientists think that a blast of Gamma radiation might have hit our planet in the halcyon days of the year 775.
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Scientists think a word's meaning, pronunciation and spelling are stored there too.
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Many scientists think that other effective cancer treatments might be created through the same idea: Target the defective protein that causes the disease.
Scientists think mercury atoms may "hop" across the surface of the Moon towards the poles, causing them to be concentrated in these regions.
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Much of the process is a kind of hit-or-miss approach in which lots of chemicals scientists think might be effective are tried out.
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The scientists think these would have been used for their smell, to give the King an "odour of sanctity", which would be "similar to Christ".
And what if the world warms at least 2C, which most scientists think likely - or 4C which the World Bank thinks probable on current trends.
Furthermore, scientists think they understand the steps they need to take to genetically modify pig tissue so that it will not be rejected by the human immune system.
Some scientists think a renegotiation of the law of the sea through the United Nations is the only way forward or a complete ban on fishing in international waters.
Seagrass beds in Loch Gairloch and Gruinard Bay were more widespread than previously thought and scientists think the beds are possibly the richest examples in north Scottish waters.
The scientists think once the rats were in a state of shock, the walls of the intestines become leaky, allowing the "self-eating" enzymes to flow into them more freely.
Very few scientists think Greenland would be stable in an Arctic with little or no summer sea-ice, and opinion is split as to whether it is past its tipping point already.
One theory that could be explored is that the nature of dark energy, which scientists think is causing the accelerated expansion of the universe, is different from the simplest human-calculated models.
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