Prof Ed Hawkins from Reading University told Sky News: "Of course there are natural factors which can cause the climate to vary, but they occur slowly, over thousands to millions of years, whereas the warming we have observed has happened over decades.".
"There is not a single credible scientific organisation in the UK or the world that agrees with him about the causes or consequences of climate change," said Mr Ward.
Earlier last week, Mr Tice had set out plans to impose taxes on the renewable energy sector and scrap the UK's net zero target, if Reform UK were in power.
Prof Hawkins said many solutions to tackle climate change would also boost energy security, provide cleaner air, and lower costs "for everyone".
Richard Tice MP told Sky's political correspondent Ali Fortescue: "There's no evidence that man-made CO2 is going to change climate change.
