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"Last year, the players from the 'Copinha' who broke into the first team were Estevao and Vitor Reis. But don't ask me for those ETs again this season, all right? Now we get the normal ones," Palmeiras' head of academy Joao Paulo Sampaio joked when asked earlier this month about the next ones in line.

The agency did find indications that some sightings were related not to ETs, but to foreign surveillance activities including by China, which Kirkpatrick has said possesses technological capabilities that may match or even exceed those of the U.S.

On Tuesday, the Commission proposed that EU governments transfer a bigger slice -- 30% rather than 25% -- of their revenues from the ETS to the EU than originally proposed.

“Importers of these goods would have to pay any price difference between the carbon price paid in the country of production and the price of carbon allowances in the EU ETS,” lawmakers said.

"For the climate, the ETS alone is more important than all the other files together," he told Reuters.