Greta Thunberg slams world leaders' inaction on climate change at the World Economic Forum in Davos.

Tennis legend Roger Federer has spoken out again at criticism volleyed at him, saying his popularity is being "misused".

He addressed the criticism regarding his partnership with Swiss bank Credit Suisse ahead of an exhibition tennis match against Rafael Nadal in South Africa.

The partnership was questioned by Swedish climate activist Greta Thunberg in January, who called out Federer's connection to a bank that supports fossil fuels.

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AP Roger Federer's hit back at criticism about his partnership with Swiss bank Credit Suisse

In an interview with Swiss publication Tages Anzeiger, Federer said his popularity was being exploited.

"I am sometimes misused for certain purposes," Federer said.

"When I help one person, I am criticised for not doing it with others. I have reached a point where I have to think carefully about what I am doing."

He also told Tages Anzeiger he was overlooking the criticism.

"I can't be everywhere, I can't do everything. I am also a father and tennis player," he said.

He is cognisant, however, of his ability to influence.

"I am aware that I can make a difference, take the microphone and address certain things. But I can't do that all the time," he said.

"I know I can make a difference with my popularity. For others, for the planet, for the animals. And I think it's good what has recently been raised about collective consciousness."

GETTY IMAGES "@RogerFederer do you endorse this?" asked Greta Thunberg.

He also had a message for the climate activist Thunberg.

Federer told the publication that "attacking others" was not the right way of discussing climate change.

"It is important that you choose the right things at the right time and get your message across in a fair way. Not by attacking others," he said.