Shell, Unilever Seek 1 Trillion-Ton Limit on CO2 Output

Royal Dutch Shell Plc and Unilever NV joined 68 other companies in urging world governments to cap cumulative carbon emissions since the industrial revolution to 1 trillion metric tons to contain rising temperatures.

The emissions cap is needed to stabilize the increase in temperatures since the 19th century to 2 degrees Celsius (3.6 degrees Fahrenheit), according to an e-mailed statement. That’s the level beyond which scientists say the rising seas, more intense storms and melting glaciers caused by global warming may become dangerous.