(The opinions expressed here are those of the author, a columnist for Reuters.) FILE PHOTO: Coal is unloaded onto large piles at the Ulan Coal mines near the central New South Wales rural town of Mudgee in Australia, March 8, 2018. Picture taken March 8, 2018. REUTERS/David Gray LAUNCESTON, Australia (Reuters) - A court ruling that Royal Dutch Shell must speed up plans to curb greenhouse gas emissions rocked the global oil and gas industry, but another decision in a case brought by eight school-aged teens and a nun may end up being more significant. The order by a Dutch court that Shell must drastically deepen its planned emission reductions raised fears in the industry of similar legal actions against other oil and gas majors, and concern that companies will be held liable for meeting court imposed climate change targets.