The biggest ever survey on climate change has found that almost two-thirds of people think it is a global emergency.

The most popular options for tackling the crisis were conserving forests, using renewables, adopting climate-friendly farming techniques and investing more money in green businesses. The least popular course of action was adopting a plant-based diet.

The survey canvassed the views of 1.2 million people and was conducted by the United Nations Development Programme (UNDP) from 7 October to 4 December 2020.

The poll showed that overall 64 per cent of respondents thought climate change was a global emergency, ranging from 69 per cent of under-18s to 58 per cent of over-60s.

The figure climbed to 81 per cent among those in the UK and in Italy, who topped the poll, while at least half of respondents in all countries said they thought there was a global climate emergency.

In the UK, where 21,189 people responded to the survey, youngsters were also more likely to think climate change was a global emergency, with 86 per cent of under-18s saying it was.

The figure was over 80 per cent for both the 18-35 and the 36-59 age groups, and although the over-60s were slightly more sceptical, 78 per cent of them believed climate change was a global emergency – the highest level worldwide for their age group.

In the United States, which has recently rejoined the Paris climate accord, 65 per cent of respondents thought climate change was a global emergency.

The poll was conducted by distributing questions through adverts in popular mobile gaming apps to 50 countries.

More than 30 million invites to the survey were issued to people when they played a popular mobile game – such as Words With Friends, Angry Birds, Dragon City or Subway Surfers.

The findings were weighted by polling experts at Oxford University to be as representative as possible for each country.

Cassie Flynn, the UNDP’s strategic adviser on climate change, told The Guardian: “The voice of the people is clear – they want action on climate change.

“If 64 per cent of the world’s people are believing in a climate emergency then it helps governments to respond to the climate crisis as an emergency.

“The key message is that, as governments are making these high-stakes decisions, the people are with them.”

Prof Stephen Fisher, from the Department of Sociology at Oxford said that the survey shows “that most people clearly want a strong and wide-raging policy response” to climate change.

Additional reporting by PA