El Ártico: ahora más tibio
Arctic warmest in two millennia
Temperatures in the Arctic are now the highest they've been for 2,000 years, according to scientists. Researchers in the United States say that it is one of the clearest signs yet that human activity is warming the planet.
Reporter: Richard Black
Scientists have produced evidence showing dramatically that the current temperature rise there is highly unusual. For most of the last two thousand years, the Arctic slowly cooled, a consequence of variations in the Earth's orbit.
But over the last century, the cooling abruptly reversed, and the region is now warmer than at any time in the 2,000 year record. Writing in the journal Science, the researchers say this shows how quickly the Arctic responds to climatic changes.
Richard Black, BBC News
produced evidence (han) comprobado (con evidencias)
a consequence una consecuencia/un resultado
reversed cambió dramáticamente
responds to (está) afectado por
climatic changes cambios climáticos