The correct answer is option 4: Green Economy: Does it Include You?

Option 1: "Your Planet Needs You-Unite to Combat" is not the correct theme for World Environment Day, 2012. This option suggests the importance of coming together to address environmental issues, but it does not specifically focus on the concept of a green economy.

Option 2: "Many Species. One Planet. One Future" is not the correct theme for World Environment Day, 2012. While this option highlights the importance of preserving biodiversity and protecting the planet, it does not specifically address the concept of a green economy.

Option 3: "Forests—Nature at Your Service" is not the correct theme for World Environment Day, 2012. This option emphasizes the importance of forests and their role in providing various services to humanity, but it does not specifically focus on the concept of a green economy.

The correct theme for World Environment Day, 2012 was option 4: "Green Economy: Does it Include You?" This theme highlights the need for a transition towards a sustainable and inclusive economy that takes into account environmental considerations. It encourages individuals and communities to understand their roles and responsibilities in promoting a green economy and achieving sustainable development.