Filters stop emission of gas into the atmosphere.

Today, the largest uncertainty in projecting future climate conditions is the level of greenhouse gas emissions going forward. Future global greenhouse gas emissions levels and resulting impacts depend on economic, political, and demographic factors that can be difficult to predict with confidence far into the future.

Algeria needs to reduce its greenhouse emissions.

Technological innovation is essential for reducing the cost of current mitigation technologies, leading to the invention and dissemination of new zero and low-carbon technologies and enhancing the capacity of countries to reduce their emissions.

In November 2013, the U.S., Norway, and the U.K. launched a public-private partnership to support forests in developing countries, with the goal of reducing emissions from deforestation and promoting sustainable agriculture.

The mission of the Compton Gamma-Ray Observatory was to study gamma-ray emissions in not only our galaxy, but other galaxies beyond ours.

By determining the time between the emission of the sound pulse and its reception, the sonar transducer can determine the range and orientation of the object.

The yellow vest protests began over a fuel tax hike intended partly to fund climate measures. As a result, some analysts suggest the yellow vests show that people ultimately are not willing to make sacrifices to curb emissions.

Because their rapid pulse of radio emission is so predictable, a large array of well-understood pulsars can be used to measure extremely subtle abnormalities, such as gravitational waves.

1/4 of the world's carbon dioxide emissions are from America: its per-capita emissions are also the greatest in the world.