2. Explain why carbon dioxide in the atmosphere is increasing.

3. Describe one explanation for why Earth's climate is becoming warmer.

4. Analyze the factors that have limited the effectiveness of the Kyoto Protocol.

Answer: Carbon dioxide concentrations are rising mostly because of the fossil fuels that people are burning for energy.

(1) Extra greenhouse gases in our atmosphere are the main reason that Earth is getting warmer.

(2) Greenhouse gases, such as carbon dioxide (CO2) and methane, trap the Sun's heat in Earth's atmosphere.

(3) It says that the 1997 Kyoto Protocol was an unmitigated success, with every single one of the 36 countries that signed up reducing their mean annual greenhouse gas emissions from 2008-2012 by an average of 5% relative to the levels seen in 1990. Jun 15, 2016 Many argue that Kyoto's failure is due to deficiencies in the structure of the agreement, such as the exemption of developing countries from reductions requirements, or the lack of an effective emissions trading scheme. by 2012