That make no sense to propose policies to shift to political themes when people seem to oppose to it and have enough protest power to make them fail.
For instance the Grenelle Environment Round Table gave rise to a bill known as "Grenelle I" adopted almost unanimously in the Assembly in October 2008.
The Grenelle Environment Round Table introduced the HGV tax, officially the "national tax on goods transport vehicles", sometimes called "ecotax" or "ecoredevance poids lourds", should have been the French version of the service-related HGV tax applicable in France, the aim of which is to reduce road transport deemed to be polluting and energy-intensive and to finance the development of river or rail transport. The principle of such taxation "had been widely adopted by the political class during the Grenelle Environment Round Table".
But In the autumn of 2013, demonstrations and sabotage were organised in Brittany (by the Red Bonnet Movement) to protest against the HGV tax, calling it an "eco-tax", following which (in the autumn of 2013) the government decided to freeze its implementation. In October 2014, when its implementation had been postponed until early 2015, the Minister of Ecology Ségolène Royal suspended the ecotax.
The carbon tax was part of the "ecological pact" signed by all candidates in the 2007 presidential election. At the end of the Grenelle Environment Round Table on 25 October 2007, President Nicolas Sarkozy pledged to create "a climate-energy tax in return for a reduction in labour taxation". The carbon tax was finally introduced in 2014 in the form of a "carbon component" proportional to CO2 emissions. From an initial amount of €7 per tonne of CO2, it was planned to increase it each year. However, the increases have to be ratified each year by the parliament as part of the finance law. The draft finance law for 2018 foresees a level of €65.40 in 2020 and €86.20 in 2022; according to Nicolas Hulot, Minister for Ecological and Solidarity Transition, the target of 100 €/t CO2 in 2030 is not called into question6. However, following the Yellow Vests movement, the Presidency of the Republic announces that the planned increase will not be included in the finance bill for 2019.
So why do the French political parties seem to be unanimous on these environmental issues when a part of the people who have a fairly significant power of nuisance oppose them? Is there a rupture between political elites and their voters, a kind of misrepresentation? Or were these laws really shared by the grassroots of the parties - is it that these failures are only shared by a single sub-population?