Louise Linton, the wife of Treasury Secretary Steven Mnuchin, displayed her support for environmental activist Greta Thunberg in a now-deleted Instagram post just days after her husband mocked the Swedish teen for her views on climate change. “I stand with Greta on this issue,” Linton wrote on her page. “(I don’t have a degree in economics either) We need to drastically reduce our use of fossil fuels. Keep up the fight @gretathunberg.” The Scottish-born actress, who describes herself as “Not a Republican. Not a Democrat. Humanitarian & Animal welfare activist. Pro-Environment. Vegan ” removed the posting on Saturday but screenshots...