Financial Times: High quality global journalism requires investment. Please share this article with others using the link below, do not cut & paste the article. See our Ts&Cs and Copyright Policy for more detail. Email ftsales.support@ft.com to buy additional rights. http://www.ft.com/cms/s/0/a1d14842-7f41-11e5-98fb-5a6d4728f74e.html#ixzz3qFtKcKTM The UN summit due to finalise a new global climate change agreement in Paris next month should look at raising the cost of burning fossil fuels, says French cabinet minister,...