The legendary environmentalist said: “I don’t know what else he had to do, but it would have to be very, very important to dodge this one.”
The criticism comes after Downing Street went to war with Channel 4 over its placing of an ice sculpture in the prime minister’s spot during the broadcast on Thursday evening.
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Earlier, Mr Johnson suggested he was too busy to debate the climate emergency, telling a radio interviewer: “I’ve done plenty of debates – I can’t do absolutely everything.”
But when it was pointed out on Channel 4 that the prime minister did not take part, Sir David replied: “I know. And I think that is shameful.”
In the interview, Sir David warned that the climate crisis would lead to “civil unrest on a great scale and mass migration on a great scale”.
“I think we will go on finding enough food, though it may not be precisely the choice that we will take freely. But I think that’s what I fear, anyway,” he said.
It was put to him that an 11-year-old had asked, ”Is it anyway too late to reverse climate change?”
Sir David replied: “It’s too late to reverse it. Not only in my lifetime, but in the next lifetime.
Climate change: Decade's defining issue in pictures
Show all 20
Climate change: Decade's defining issue in pictures
1/20 California
In this decade, humans have become ever more aware of climate change. Calls for leaders to act echo around the globe as the signs of a changing climate become ever more difficult to ignore
Getty
2/20 Athens, Greece
Fierce wildfires have flared up in numerous countries. The damage being caused is unprecedented: 103 people were killed in wildfires last year in California, one of the places best prepared, best equipped to fight such blazes in the world
AFP/Getty
3/20 Redding, California
Entire towns have been razed. The towns of Redding and Paradise in California were all but eliminated in the 2018 season
AP
4/20 Athens, Greece
While wildfires in Greece (pictured), Australia, Indonesia and many other countries have wrought chaos to infrastructure, economies and cost lives
AFP/Getty
5/20 Carlisle, England
In Britain, flooding has become commonplace. Extreme downpours in Carlisle in the winter of 2015 saw the previous record flood level being eclipsed by two feet
AFP/Getty
6/20 Hebden Bridge, England
Hebden Bridge in West Yorkshire has flooded repeatedly in the past decade, with the worst coming on Christmas Day 2015. Toby Smith of Climate Visuals, an organisation focused on improving how climate change is depicted in the media, says: "Extreme weather and flooding, has and will become more frequent due to climate change. An increase in the severity and distribution of press images, reports and media coverage across the nation has localised the issue. It has raised our emotions, perception and personalised the effects and hazards of climate change."
Getty
7/20 Somerset, England
Out west in Somerset, floods in 2013 led to entire villages being cut off and isolated for weeks
Getty
8/20 Dumfries, Scotland
"In summer 2012, intense rain flooded over 8000 properties. In 2013, storms and coastal surges combined catastrophically with elevated sea levels whilst December 2015, was the wettest month ever recorded. Major flooding events continued through the decade with the UK government declaring flooding as one of the nation's major threats in 2017," says Mr Smith of Climate Visuals
Getty
9/20 London, England
Weather has been more extreme in Britain in recent years. The 'Beast from the East' which arrived in February 2018 brought extraordinarily cold temperatures and high snowfall. Central London (pictured), where the city bustle tends to mean that snow doesn't even settle, was covered in inches of snow for day
PA
10/20 London, England
Months after the cold snap, a heatwave struck Britain, rendering the normally plush green of England's parks in Summer a parched brown for weeks
AFP/Getty
11/20 New South Wales, Australia
Worsening droughts in many countries have been disastrous for crop yields and have threatened livestock. In Australia, where a brutal drought persisted for months last year, farmers have suffered from mental health problems because of the threat to their livelihood
Reuters
12/20 Tonle Sap, Cambodia
Even dedicated climate skeptic Jeremy Clarkson has come to recognise the threat of climate change after visiting the Tonle Sap lake system in Cambodia. Over a million people rely on the water of Tonle Sap for work and sustinence but, as Mr Clarkson witnessed, a drought has severley depleted the water level
Carlo Frem/Amazon
13/20 Addis Ababa, Ethiopia
In reaction to these harbingers of climate obliteration, some humans have taken measures to counter the impending disaster. Ethiopia recently planted a reported 350 million trees in a single day
AFP/Getty
14/20 Morocco
Morocco has undertaken the most ambitious solar power scheme in the world, recently completing a solar plant the size of San Francisco
AFP/Getty
15/20 London, England
Electric cars are taking off as a viable alternative to fossil fuel burning vehicles and major cities across the world are adding charging points to accomodate
AFP/Getty
16/20 Purmerend, The Netherlands
Cities around the world are embracing cycling too, as a clean (and healthy) mode of transport. The Netherlands continues to lead the way with bikes far outnumbering people
Jeroen Much/Andras Schuh
17/20 Xiamen, China
Cycling infrastructure is taking over cities the world over, in the hope of reducing society's dependency on polluting vehicles
Ma Weiwei
18/20 Chennai, India
Despite positive steps being taken, humans continue to have a wildly adverse effect on the climate. There have been numerous major oil spills this decade, the most notable being the BP oil spill in the Gulf of Mexico in 2010
AFP/Getty
19/20 Amazon rainforest, Brazil
More recently, large swathes of the Amazon rainforest were set alight by people to clear land for agriculture
AFP/Getty
20/20 California
This decade may have seen horrors but it has led to an understanding that the next decade must see change if human life is to continue
Getty
1/20 California
In this decade, humans have become ever more aware of climate change. Calls for leaders to act echo around the globe as the signs of a changing climate become ever more difficult to ignore
Getty
2/20 Athens, Greece
Fierce wildfires have flared up in numerous countries. The damage being caused is unprecedented: 103 people were killed in wildfires last year in California, one of the places best prepared, best equipped to fight such blazes in the world
AFP/Getty
3/20 Redding, California
Entire towns have been razed. The towns of Redding and Paradise in California were all but eliminated in the 2018 season
AP
4/20 Athens, Greece
While wildfires in Greece (pictured), Australia, Indonesia and many other countries have wrought chaos to infrastructure, economies and cost lives
AFP/Getty
5/20 Carlisle, England
In Britain, flooding has become commonplace. Extreme downpours in Carlisle in the winter of 2015 saw the previous record flood level being eclipsed by two feet
AFP/Getty
6/20 Hebden Bridge, England
Hebden Bridge in West Yorkshire has flooded repeatedly in the past decade, with the worst coming on Christmas Day 2015. Toby Smith of Climate Visuals, an organisation focused on improving how climate change is depicted in the media, says: "Extreme weather and flooding, has and will become more frequent due to climate change. An increase in the severity and distribution of press images, reports and media coverage across the nation has localised the issue. It has raised our emotions, perception and personalised the effects and hazards of climate change."
Getty
7/20 Somerset, England
Out west in Somerset, floods in 2013 led to entire villages being cut off and isolated for weeks
Getty
8/20 Dumfries, Scotland
"In summer 2012, intense rain flooded over 8000 properties. In 2013, storms and coastal surges combined catastrophically with elevated sea levels whilst December 2015, was the wettest month ever recorded. Major flooding events continued through the decade with the UK government declaring flooding as one of the nation's major threats in 2017," says Mr Smith of Climate Visuals
Getty
9/20 London, England
Weather has been more extreme in Britain in recent years. The 'Beast from the East' which arrived in February 2018 brought extraordinarily cold temperatures and high snowfall. Central London (pictured), where the city bustle tends to mean that snow doesn't even settle, was covered in inches of snow for day
PA
10/20 London, England
Months after the cold snap, a heatwave struck Britain, rendering the normally plush green of England's parks in Summer a parched brown for weeks
AFP/Getty
11/20 New South Wales, Australia
Worsening droughts in many countries have been disastrous for crop yields and have threatened livestock. In Australia, where a brutal drought persisted for months last year, farmers have suffered from mental health problems because of the threat to their livelihood
Reuters
12/20 Tonle Sap, Cambodia
Even dedicated climate skeptic Jeremy Clarkson has come to recognise the threat of climate change after visiting the Tonle Sap lake system in Cambodia. Over a million people rely on the water of Tonle Sap for work and sustinence but, as Mr Clarkson witnessed, a drought has severley depleted the water level
Carlo Frem/Amazon
13/20 Addis Ababa, Ethiopia
In reaction to these harbingers of climate obliteration, some humans have taken measures to counter the impending disaster. Ethiopia recently planted a reported 350 million trees in a single day
AFP/Getty
14/20 Morocco
Morocco has undertaken the most ambitious solar power scheme in the world, recently completing a solar plant the size of San Francisco
AFP/Getty
15/20 London, England
Electric cars are taking off as a viable alternative to fossil fuel burning vehicles and major cities across the world are adding charging points to accomodate
AFP/Getty
16/20 Purmerend, The Netherlands
Cities around the world are embracing cycling too, as a clean (and healthy) mode of transport. The Netherlands continues to lead the way with bikes far outnumbering people
Jeroen Much/Andras Schuh
17/20 Xiamen, China
Cycling infrastructure is taking over cities the world over, in the hope of reducing society's dependency on polluting vehicles
Ma Weiwei
18/20 Chennai, India
Despite positive steps being taken, humans continue to have a wildly adverse effect on the climate. There have been numerous major oil spills this decade, the most notable being the BP oil spill in the Gulf of Mexico in 2010
AFP/Getty
19/20 Amazon rainforest, Brazil
More recently, large swathes of the Amazon rainforest were set alight by people to clear land for agriculture
AFP/Getty
20/20 California
This decade may have seen horrors but it has led to an understanding that the next decade must see change if human life is to continue
Getty
“I don’t think you can reverse it. I think the best we can hope is that we will slow it down and slow it down considerably. If we can do that.”
He turned his fire on all political leaders, saying: “It’s very difficult to detect real action in politicians anyway.”
The Tories made a complaint to the watchdog Ofcom about Channel 4 after the debate – and “sources” issued dark threats about reviewing the broadcaster’s licence if the party wins the general election on 12 December.
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