Rich countries have an obligation to help developing countries pursue a green growth strategy, visiting US President Barack Obama said on Wednesday.Obama made the remarks while meeting with young people from across Southeast Asia in a "town hall" exchange in the historical town of Luang Prabang in northern Laos, Xinhua news agency reported.He said green growth strategy will reduce poverty while addressing greenhouse gas emissions contributing to the climate change.The "town hall" exchange touched on a series of topics including climate change, health, environment, trade and economy.The US President called on young people of the region to actively contribute to solutions in the face of difficulties and challenges.He cited the example of Alibaba founder and chairman, China's Jack Ma as an example of the dynamism that could see individuals rise to their potential through innovation and enterprise.