The researchers also determined that the companies would be in the red if they were responsible for the social costs of the carbon in their reserves,which scientists compute around $185 per metric ton of carbon dioxide."The general public maybe understand offsetting to be a sort of magic eraser,and that's just not where we're at,"said Nina,a research fellow in the study. Carbon offsetting essentially means investing in tree planting or other environmental projects to attempt to offset for carbon emissions.Trees are one of the cheapest ways to do this because they naturally absorb planet-warming carbon.Oil-and-gas companies have promoted tree-planting as key part of carbon offset programs in recent years. To do their calculations,the researchers looked at the 200 largest oil-and-gas companies and calculated how much carbon dioxide would be released if their fuel is burned.They focused only on tree planting because the expense and technological development needed for other forms of carbon capture are still mostly cost-prohibitive.But Nina warned that focusing only on carbon capture is too simple,pointing out that done properly,planting trees can also improve food security,support biodiversity,and protect communities from natural disasters. The research effectively makes the point that it's financially impossible to offset enough carbon by planting trees.And asking companies to pay for all the emissions their fuel will later create is a chimera. 28.What makes it hard to remove all carbon by planting trees A.Trees have a long life cycle. B.Photosynthesis works slowly C.There isn't enough available land. D.Tree planting takes too much labor. 29.What does the author try to illustrate by listing numbers in paragraph 2 A.To prove the loss of the companies. B.To highlight the impact of carbon emissions. C.To provide evidence to support tree-planting D.To show the impracticality of forest-based carbon offset. 30.What are the limitations of the research A.Ignoring co-benefits. B.Lacking long-term follow-up. C.Overlooking tech costs. D.Overemphasizing market trends. 31.What does the underlined word"chimera"in the last paragraph mean A.Practical idea. B.False hope. C.Brilliant plan. D.Selfish desire. 高三英语试题第6页（共12页）
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