Macron announced €15 billion would be invested over two years in “the ecological conversion of our economy”.
The president stressed the need to “reconcile economy and ecology” in a nod to the sweeping gains of the Europe Ecology – Green Party (EELV) in Sunday's local elections marked by a record abstention rate of around 60 percent.
Hosting 150 members of a so-called “citizen's convention” on climate reform for a pre-scheduled meeting, Macron promised the creation of a fund to invest in cleaner transport and buildings, and to “invent the industries of tomorrow.”
Macron said he would implement measures immediately and a new law would be drawn up before the end of summer.
On Twitter, the president argued his government had a strong record on ecology, but conceded that “we need to go further, stronger.”
EELV party head Yannick Jadot said the vote proved that Macron had been “in denial” over growing public demand for ambitious measures to fight climate change.
He told Europe 1 radio the EELV would not join Macron's government, and urged the president to take on board a long list of measures proposed by the citizens' convention he had set up.
Macron said he would not oppose a 2021 referendum on some of the proposals, including rewriting the constitution to include mention of the urgency of protecting the environment and fighting climate change.
But he did not support a four-percent tax on company dividends or lowering the speed limit on national roads from 130 to 110 kilometres per hour.
The “citzen's' convention's brief, as defined by the president, was to set out a series of measures to combat climate change that will make it possible to achieve a reduction of at least 40 percent in greenhouse gas emissions by 2030 (compared to 1990), within a spirit of social justice.
There was heated speculation Monday that Macron would reshuffle his cabinet, possibly axing Philippe who enjoys more support than he does, according to opinion polls.
Macron has promised that the second part of is presidency would take note of failings during the first.
Government spokeswoman Sibeth Ndiaye expressed “disappointment” Sunday over the LREM's poor showing in the second round, which was held amid strict coronavirus anti-contagion measures.