即使政府摆出一副支持更绿色技术的样子，也常常会突然改变甚至逆转政策，让企业不愿投入大量资金，甚至根本不把官方说辞当回事。
Even when appearing to support greener technologies, governments are prone to sudden policy changes, sometimes retroactively, leaving businesses reluctant to commit to significant investments, or even take official statements seriously at all.