tougher

This year is potentially tougher to call, but here's a rundown of the main contenders.

And that is why Europeans are braced for fresh pressure from the US to adopt a tougher approach to China.

The mandate will become tougher next year ahead of a complete ban on new diesel and petrol cars in 2035, but car makers have suggested the rules could threaten jobs.

Expect new efforts to revoke California’s waivers to set tougher vehicle emissions standards, several of which have yet to be approved by Biden’s EPA.

It is the most controversial of recent measures that have also imposed tougher English language requirements on student visa applicants, and greater scrutiny on those seeking further study.