Environmental campaigners planted trees, collected rubbish and rallied against pollution for what organisers aimed to make the world's biggest day of climate-change activism.
Southeast Asian nations should encourage businesses to protect the region's endangered plants and animals by showing profit can be made from biodiversity.
Delegates are gathering in Tianjin, China from October 3-9 for the final round of UN climate talks before this year's summit in Mexico, which begins at the end of November.