First produced in a lab back in 2004, graphene is essentially a single layer of pure carbon atoms bonded together in a honeycomb lattice so thin it's actually considered two-dimensional.
Richer countries must do more to cut backcarbon emissions.
较富裕的国家必须作出更大的努力来减少碳排放量。
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They believe that the best we can do is keep it at a reasonable level, and at present the only serious option for doing this is cutting back on our carbon emissions.