Which climate change treaty committed the countries that signed and ratified it to reducing carbon dioxide emissions below 1990 levels?

The european union was formally established in

The us and canadian governments are doing all of the following to combat environmental problems except a. encouraging the use of public transportation b. enacting clean water policies c. requiring emissions testing d. limiting animal populations in some regions

What is the difference between the formation and characteristics of intrusive igneous rock and extrusive igneous rock?