"There are drug treatments that can reduce the intra-ocular pressure, but that means life-long treatment involving two or three kinds of eye drops three times a day," says Prof.

“药物治疗可以降低眼压，但这意味着终身治疗，每天三次滴两或三种眼药，”Assia教授说。

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Prof Benton added that evolutionary change added an additional pressure to population management schemes, namely that it was much more difficult to reverse than ecological change.

BBC: Environmental change 'triggers rapid evolution'

If you really want to reduce energy consumption, extreme social pressure is the way to do it, says Prof Anderson.

BBC: Technology

But in the public sector, workers are trying to create political pressure on the government, making public opinion crucial, Prof Gall says.

BBC: Strikes: How important is public support?