第1个回答 2014-09-03
61.the
62.while
63.will help
64. increasing
65.faster
66.are
67.consideration
68.to
69. calculations
70. that
附原文
Farmers shouldn't be worried about climate change, and instead focus on their year to year decisions.
That's the opinion of Professor Graham Farquhar from the Australian National University's Research School of Biology.
He delivered that message to scientists from around the world at this year's Borlaug 100 Summit on Wheat for Food Security in Mexico.
Professor Farquhar says, while rising temperatures may reduce crop yield, increased carbon dioxide will deliver better growth.
"I think it's likely with the increasing temperature that the development of wheat crops will be affected, because the development is quite sensitive to small changes in temperature," he said.
"Beyond temperature perhaps the more important the carbon dioxide concentration itself affects photosynthesis and growth and so the crop will be able to take up more carbon dioxide and grow faster.
"So the question is whether things like the hastened development caused by increased temperature could reduce yield but the increased CO2 should increase it.
"On balance I think the effects for the next 50 years are likely to be in favour of increased growth, but that's without taking into account all the unknown effects of possible changes and distribution of rainfall and so on."
Professor Farquhar is optimistic that despite the challenges Australian farmers will adapt to the changes.
"I think it's likely that they will respond as they have in the past to extremes of weather and climate variability," he said.
"I think climate change itself is sufficiently slow that it's very difficult to pick up, it's sort of almost like noise within the natural variability of climate.
"Our calculations suggest it will be some decades before we can really be sure that climate has changed in terms of things that most Australians would be interesting in like rainfall and so on."本回答被网友采纳