People should be saying "how dare you" to Swedish climate change activist Greta Thunberg after she predicted in 2018 climate change would wipe out the world on Wednesday. .“A top climate scientist is warning that climate change will wipe out all of humanity unless we stop using fossil fuels over the next five years,” said Thunberg in a since-deleted tweet. .Thunberg linked to an article from Grit Post about Harvard University atmospheric chemistry professor James Anderson warning in 2018 climate change is pushing Earth back to the Eocene Epoch from 33 million BCE — when there was no ice on either pole. .Anderson said current pollution levels depleted atmospheric ozone levels to those not seen in 12 million years..While some governments made commitments to reduce carbon emissions, he warned the measures were insufficient to stop the extinction of humanity because of climate change. Instead, he's calling for a Marshall Plan-style endeavour in which all of the world takes extreme measures to transition off of fossil fuels within the next five years..The Packard Network CEO Bret Packard mocked Thunberg for her inaccurate prediction. .“Such a scam artist — watch out, I think she just graduated from high school — LOL,” said Packard. .American business attorney and consultant Roger Doumanian said it was comedy hour. .“Everyone is trying to play God,” said Doumanian. .Thunberg released her book, called the Climate Book, in the United States and Canada in February. .READ MORE: Green guru Greta Thunberg publishes handbook for climate change activists.“I have gathered the wisdom of over one hundred contributors to highlight the many different crises we face and equip us with the knowledge we need to avoid a climate disaster,” she said. .She said this is “the biggest story in the world, and it must be spoken as far and wide as our voices can carry and much further still.” She thanked people for their support.