NEW YORK (NYTIMES) - The number of Americans who feel passionately about climate change is rising sharply, and the issue appears likely to play a more important role in this year's election than ever before, a new survey shows.

What's more, despite the turmoil caused by overlapping national and global crises, support for action to curb climate change has not diminished. Backing for government to do more to deal with global warming, at 68 per cent in May 2018, was at the same level in 2020, according to the survey, issued Monday (Aug 24).

"People can walk and chew gum at the same time," said Professor Jon Krosnick, an expert of communication, political science and psychology at Stanford University and the leader of the project.

Many social scientists might have predicted a different result. A hypothesis in psychology called the "finite pool of worry" suggests that when people's level of concern about one issue rises, concern about others tends to fall. Climate change, under such thinking, appeared to be a "luxury good" issue, the sort of thing that's nice to have if you can afford it, but which gets pushed down the list of priorities in tough times.

The survey, the latest in a 23-year series, suggests that, instead, climate change has become important enough to Americans that it remains prominent despite the global coronavirus pandemic, with its rising death count in the United States, as well as the related national economic crisis, the pressures of self isolation brought on by the pandemic and a never-ending rush of other news.

The most striking part of the survey, Prof Krosnick said, is the growth of a group he called the "issue public" around climate change.

An issue public is a community that feels an issue is extremely important to them personally.

"They are the people who make things happen on the issue," Prof Krosnick said.

That means, for example, making donations to lobbying groups, sending emails to lawmakers, attending rallies - and voting.

The issue public around climate change has grown tremendously over time, the survey suggests. In 2015, the group was 13 per cent of the population. By 2020, it had nearly doubled to 25 per cent.

Democratic candidates appear to be reaping the benefits of that shift. For instance, a wave of climate donors has flocked to former vice-president Joe Biden. That's a departure from 11 years ago, when some party leaders discouraged fundraising based on climate change.

Prof Krosnick said the issue public behind climate change, at 25 per cent, was now the second largest he has seen, trailing only the group focused on abortion, at 31 per cent. By comparison, the group of US adults who are passionate about gun control generally hovers around 17 per cent, and capital punishment weighs in at about 14 per cent.

"I would never have predicted this 25 per cent," Prof Krosnick said.

He suggested that President Donald Trump's efforts to undermine climate science and government initiatives to deal with global warming could be behind the surge.

"The Democrats just gained a significant number of people who are powerfully now inclined toward them on the issue," Prof Krosnick said.

In an election that could, in battleground states, turn into a game of inches, the rise of a passionate community could make a difference, he said.

Of course, interest in an issue doesn't necessarily translate into votes. That's why environmental groups have been at the forefront of efforts to raise voter turnout and ensure the integrity of the election, said Ms Myrna Perez, director of the voting rights and elections program at the Brennan Centre for Justice at NYU law school.

"Environmental groups are acutely aware of the fact that their agendas are not going to be accomplished if the vote is not free, fair and accessible," Ms Perez said. "Reform generally is not going to happen unless our democracy is representative and robust and participatory - and the environmental groups are getting it."

Prof Krosnick's survey supported the findings of one published in May by researchers at Yale University and George Mason University. In that project, 73 per cent of those polled said that climate change was happening, which matches the highest level of acceptance previously measured by the survey, from 2019.

The new survey not only corroborates the earlier findings but also extends the period of polling through August as the compounding crises, along with the national tumult over racial injustice and the often-violent police response to demonstrations, dominated the news.

What's more, the results were remarkably consistent across all 10 weeks that the survey was conducted. Data was drawn from calls to 999 US adults, a process that started in May.

The survey was a joint project of Stanford, Resources for the Future, a Washington research group, and ReconMR, a survey research company.

Mr Anthony Leiserowitz of the Yale Programme on Climate Change Communication, which released the survey published in May, said the new polling showed that climate change was "not fading from people's memories, it is not fading from their sense of importance just because other issues have arisen."

A significant number of people have considered climate change, Mr Leiserowitz said, and "pretty much made up their minds where they stand."