The claims for biochar are not supported by all, however. Biofuels Watch, a British lobby group, worries that a craze for the stuff could see virgin land tilled specifically to grow crops such as switchgrass, whose only purpose was to be pyrolised and buried. That tillage would release carbon dioxide and methane. But the alternative, growing those crops on existing farmland, would encourage the clearance of more land to grow the food crops that had been displaced. Indeed, Kelli Roberts, another researcher at Cornell, told the meeting that, taking all factors into account, growing switchgrass for biochar may do more harm than good. Corn stover, garden waste such as grass clippings, and offcuts from forestry and timber production are better bets, she reckons.
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She reckons we ought to call her.
她认为我们应该打电话给她。
She reckons on doing away with one child a week.
她总计每星期废除一个孩子。
Among those likely to do so are Britain and Switzerland, she reckons.
她估计,英国和瑞士可能采取这种做法。
She said, no matter what the other person does, she reckons she'd get a better grade if she chose Alpha.
她说无论别人怎么选,她觉得选α会使自己得到最优的结果
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