Caroline Lucas has issued a rallying cry for the public to put pressure on the Government to tackle air pollution - which she believes is a public health crisis that is being "wilfully ignored by those in power".
The co-leader of the Green Party has helped push fringe eco worries into the mainstream, bringing the green agenda such popularity that she has gained increased majorities for her Brighton Pavilion seat each time it's been contested.
For years, she has spoken out about our need to radically re-haul how we travel and live to conserve the quality of our air. And not a moment too soon, as 400,000 early deaths in the UK are attributable to air pollution.
Here's her thoughts on what we can do - now - to make the change we need.
We need to open our minds outside the everyday use of cars.
"We must be open to contemplating a rejection of the received wisdom which puts the motor car at the centre of cities' development. Once our minds are open to different ways of designing our cities, we're far better able to legislate to protect peoples' lungs."
We should change the way we travel, when possible.
"While it's the Government who are responsible for tackling the air pollution crisis, we can all make a difference ourselves too. The best thing we can do is to try and cut down our use of private cars. Walking or cycling to work is both good for our health and cuts down on air pollution."
Or, we can take action against the high costs of more environmentally friendly travel.
"In recent years we've seen the cost of driving drop through the floor, while catching a train or bus has becoming increasingly exorbitant. Reversing that trend is crucial. Why not join a public transport pressure group and lobby the Government to lower prices?"
We should take note of what other countries are doing to reduce air pollution.
"In Paris, they occasionally ban all cars from the city centre during air pollution episodes, and Norway's electric car infrastructure means that forty per cent of their new car sales are electric."
We need to hold car manufacturers accountable for the environmental damage they cause.
"Car companies who have cheated vehicle emissions testing over many years should pay for the damage they have caused to our health and the environment. Despite a £10.8bn fine being levied by the US government on one car company alone, here in the UK not a single penny has been paid by the car manufacturers that deliberately cheated the system at the expense of people's lives across the UK."
We must open our eyes to the crisis at hand and take action.
"Thousands of people die prematurely each year because of toxic air - yet action is happening far too slowly. Ultimately, public pressure can force the Government to face up to this emergency."