If the wood was buried and transformed into coal 250 million years ago and we burn it today, we are utilizing the energy stored by photosynthesis from late Palaeozoic sunlight.

• 如果树木是在2亿5千万年之前被埋藏然后变成了煤，我们今天烧这煤便是在燃烧由晚古生代阳光的光合作用储存的能量，