That article seems rather confused. They asked people "Which of the following issues has, over the past decade, most changed the way you look at your future?"

That article seems rather confused. They asked people "Which of the following issues has, over the past decade, most changed the way you look at your future?" and then assume that this is what will define the 2024 election year. Clearly COVID will not. So that leaves climate and immigration, but the question is very vague. "Changed the way you look at the future" doesn't imply you think there's a crisis or will vote for a party that treats the issue as a crisis. The Guardian and the organization they cite both think it does.