The NY Times on market approaches to reducing greenhouse gases

This graphic is from A Price Tag on Carbon as a Climate Rescue Plan, May 30.

How a Carbon Market Works

Governments around the world are experimenting with issuing permits that allow industries to emit carbon dioxide and other greenhouse gases, then restricting those permits to rein in carbon emissions.

CAP

CAP LOWERED

Purchased or

traded permits

Carbon

dioxide

emissions

Carbon

permits

Remaining

carbon

permits

Freely issued permits

CAPPED INDUSTRIES

INDUSTRY A

INDUSTRY B

CAPPED INDUSTRIES

CAP AND PERMIT

The government imposes a cap on the total amount of greenhouse emissions allowed from major industries, then issues permits to match the amount of the cap. Each permit allows the emission of one ton of carbon dioxide, or equivalent.

ISSUE, BUY AND TRADE

Initially, most of the permits are given to industries at no cost. The remaining permits can be bought at a government auction or traded in a carbon market set up for that purpose.

LOWERING THE CAP

The government gradually lowers the carbon cap by a few percent a year, which reduces the number of available permits and cuts the total amount of pollution allowed by the industries under the carbon cap.

No reduction

in emissions

Offset credits

Steep reduction

Investment

CARBON-REDUCING

PROJECT

INDUSTRY A

INDUSTRY B

INDUSTRY A

REDUCING TOTAL EMISSIONS

Industries can reduce their emissions by spending money to upgrade their facilities and equipment, or they can use the carbon market to purchase the carbon permits needed to cover their emissions — whichever is cheaper.

CARBON OFFSETS

Industries can also invest in projects elsewhere that lower carbon emissions, like forestry or burning methane from dairy cows. These projects create “offset credits” that can be used or sold, usually at a lower price than government-auctioned permits.

By The New York Times

Source: California’s Air Resources Board