Is California for sale? A lighthearted petition to buy the state of California for Denmark prompted more than 200,000 signatures by Wednesday in response to President Donald Trump’s talk about taking control of Greenland, a vast and mineral-rich Arctic island.

The tongue-in-cheek campaign comes as President Donald Trump has made it clear that his interest in purchasing Greenland is definitely not a joke.

Denmarkification organizers have set a goal of crowdfunding $1 trillion to buy California – but the petition is only collecting signatures, not donations. With melting sea ice opening up new Arctic shipping routes, experts say Greenland's location is of particular strategic importance.