Helsinki to pay residents to eradicate invasive plants

HELSINKI, May 20 (Xinhua) -- The Finnish capital is set to pay residents to eliminate invasive plants through a mobile app game, Helsinki announced on Monday.

Starting on June 3, Helsinki residents will be able to earn cash by recording and mapping the location of plants such as lupines and Himalayan balsam, using the Crowdsorsa app.

The crowdsourced initiative will pay players up to 25 cents per square m