The discrepancy can be explained by long term changes in vegetation and ice cover.

植被和冰层覆盖的长期变化能够说明这种差异。

youdao

So far, the rise in carbon dioxide seems to be fairly smooth over time, but the change in vegetation is jerkier.

到目前为止，似乎二氧化碳随着时间变化而增加的幅度相当平稳，但植被的变化却有更大的波动。

youdao

He said more research was needed to understand the knock-on effects for creatures from the changes in vegetation inadvertently caused by emissions from cars, industry and farms.

他说需要更多的研究来理解汽车、工业及农业的无意排放造成的植物变化对生物的间接影响。

youdao

In his homily the archbishop said the management of the unique heritage of this beautiful and fascinating territory, rich in colors, vegetation and art, is lacking.

VOA: standard.2009.10.10

Anyone who is acquainted with these works will immediately recognize in the poem certain references to vegetation ceremonies.

熟悉这些作品的人,会马上在诗里认出,某些提及植物仪式的部分。

耶鲁公开课 - 1945年后的美国小说课程节选

The Okefenokee,which is already nearly choked with plants, would probably fill in,dry up, and become just another cypress and pine forest were it not for range fires that come along every once in awhile and burn out decayed vegetation.

VOA: standard.2010.03.29

Rising temperatures have also resulted in vegetation sprouting up in unexpected places along the tundra.

BBC: Update on Alaska��s national parks

The airboat became stuck in vegetation and couldn't be turned around.

CNN: Family safe after Everglades adventure

What my colleagues and I are discovering from our own work in Alaskan tundra is that this shift in vegetation cover has implications -- some good, some bad -- for the animals that depend on it for food and shelter.

CNN: Next global warming worry: Thawing tundra