Greta Thunberg had two wishes for her 18th birthday on Sunday.The first was a “promise from everyone that they will do everything they can” for the planet, she said in an exclusive interview with The Sunday Times.She had another, more tangible gift: Replacement headlights for her bike.“In Sweden, it gets very dark in the winter,” she said.The climate activist, who is from Sweden, also took to Twitter to celebrate her birthday with a jab at climate change conspiracy theorists.”Thank you so much for all the well-wishes on my 18th birthday!” she said. “Tonight you will …