Macron initially said he doesn't usually comment on French affairs while overseas, but later called the resignation a personal choice, adding that France would "continue its work" on combatting climate change. "It is up to us to guarantee European security, and therefore European sovereignty", Macron told an audience of some 250 diplomats, lawmakers, and worldwide relations experts.
But in this morning's interview, Hulot deplored the lack of a common government vision for the environment, his disagreements with Minister of Agriculture Stéphane Travert over the transformation of France's agriculture, and the power of lobbyists.
Hulot said he feared that his "most painful" decision would only make things worse for the environment, but expressed hope that "my departure will prompt a deep introspection of our society on the reality of the world".
French President Emmanuel Macron is calling for increased defense in an effort to enhance European security.
"This may not be the right protocol, but if I had warned them they might have talked me out of it yet again", Hulot said. The shock announcement came the day after Mr Hulot and Mr Macron met members of the hunting lobby at the Elysee Palace to discuss hunting reforms.
But the former TV presenter and prominent green party politician said his choice - the "most hard decision of my life" - had been steeped in a series of disappointments.
"Have we starting to reduce the use of pesticides? The response is no", government spokesman Griveaux said.
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Hulot said he'd been mulling his resignation for several months, but one of the last straws was a meeting Monday with Macron about hunting.
According to a law passed under president Francois Hollande, France should have reduced the part of nuclear from 75 percent of electricity produced to 50 percent by 2025.
Griveaux added, "I would have liked him to stay because he brought his own voice, his own convictions, his history of campaigning, so I regret that he's going and above all I regret the fact that we haven't been able to demonstrate everything he's done over the 14 months that he's been in government".
Macron's vision included a more united front on at least half a dozen security topics and comes after U.S. President Donald Trump's repeated demands for Europe to become more self-sufficient in its defense. "The answer is no", Hulot listed Tuesday.
The divergences between Macron and his ecology minister reflects the French leader's approach to environment, which is mainly focused on climate change and Carbon dioxide emissions at the expense of other challenges like the fight against pollution or the protection of biodiversity.
Mr Macron's speech aimed to set out the roadmap of French diplomacy for the next year.
Nicolas Hulot was among Macron's first ministerial appointments following his May 2017 election victory.