The correct answer is: B. International Year of Planet Earth
The United Nations declared 2007 as the International Year of Planet Earth to raise awareness of the importance of protecting the planet and its resources. The year was marked by a number of events and initiatives, including the release of the Intergovernmental Panel on Climate Change’s Fourth Assessment Report, the launch of the Global Earth Observation System of Systems, and the World Climate Conference 3.
The International Year of Planet Earth was a success in raising awareness of the challenges facing the planet and the need for action to protect it. However, much more needs to be done to address these challenges. The UN has called for a new era of sustainable development, and the International Year of Planet Earth was a step in the right direction.
The other options are incorrect. Option A is incorrect because the United Nations did not declare 2007 as the Year of Rights of Internally Displaced Persons in Colombia. Option C is incorrect because the United Nations did not declare 2007 as the International Heliophysical Year. Option D is incorrect because the United Nations did not declare 2007 as all of the above.