"In the oil sands, we may see overall emissions still increasing by 4 to 6 percent a year."

The overall emissions would be dictated by how the hydrogen was produced.

In no ways does it mandate them to cut back on their overall emissions.

But that's happening at around 1% per year - not enough to prevent overall emissions from the expanding industry from rising.

Making the overall emissions from flying in the future absolutely lower than they are today.

Much less bureaucratic than cap-and-trade but cannot deliver an exact cut in overall emissions.

While these are outside our direct control, we know that they account for the majority of our overall emissions.

Politicians did nor explain, why some old cars would not remain also in the traffic and increase the overall emissions.

Among their demands were annual targets and an overall emission cut of 90% by 2050.

This method also means the fuel burns more efficiently, reducing overall emissions.