Reef Watch dive team preparing for dive around Koh Tao island. The Rainbow Warrior is touring Thailand to highlight the urgency of the climate change crisis and urge the Thai government to take action against global warming. Climate change is considered the greatest environmental threat facing the planet. It is caused primarily by the burning of fossil fuels such as coal and oil and can only be stopped if we begin the massive shift away from fossil fuels and towards renewable energy sources such as solar and wind power.