Some countries have been trying to reduce greenhouse gases emissions over the last decade, but a perfect storm of methane emissions may undo all the good work.

过去的十年，一些国家已经尽力在降低温室气体的排放，但是甲烷释放的“完美风暴”可能会抵消所有这些努力。

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That kind of expansion may also undo the good work he has accomplished on the balance sheet.

FORBES: Street Smarts

"When the Department for Energy and Climate Change increases its headcount, for example - as it has done every quarter over the past year - that only serves to undo the good work being done elsewhere to clean away unnecessary fat in the arteries of government, " it said.

BBC: UK Politics

All governments are tackling their other most pressing problem: a prospective rise in pension costs that threatens to undo all their good work on budget deficits.

ECONOMIST: Remodelling Scandinavia