The theme of World Environment Day 2017 was "Connecting People to Nature." This theme emphasizes the importance of creating a strong connection between individuals and the natural world. It encourages people to appreciate and value nature, as well as take actions to protect and conserve it.

Option 1, "Green Economy; Does it include you?" is not the correct answer. While the concept of a green economy is important for sustainable development, it was not the theme of World Environment Day 2017.

Option 3, "Think, Eat, Save" is also not the correct answer. While this theme focuses on reducing food waste and making sustainable food choices, it was not the theme of World Environment Day 2017.

Option 4, "Many Species, One Planet, One Future" is not the correct answer. Although it highlights the importance of biodiversity conservation, it was not the theme of World Environment Day 2017.

Therefore, the correct answer is option 2, "Connecting People to Nature." This theme aims to raise awareness about the significance of nature in our lives and foster a sense of responsibility towards its preservation.