Federalists believed that the Bill of Rights was unnecessary--that the Constitution wouldn't affect individual rights. The anti-Federalists wanted the assurance the individual liberties would not be surrendered.
Natural gasses like methane for example.
Hope this helps.
Answer:
Green house effect and human activity.
Explanation:
-The green house effect: Some gases in the atmosphere trap the heat and doesn't allow it to scape making the Earth warmer.
-Human activity: The industrial activities have increased the carbon dioxic levels that have contributed to the higher temperatures. Also, deforestation, fluorinated gases and fertilisers containing nitrogen have contributed to climate change.
