A seven-month-old baby survived for three days with a bullet in her chest after her parents killed themselves and her toddler brother over global warming fears, reports say.

Argentinian couple Francisco Lotero, 56, and Miriam Coletti, 23, wrote in a suicide note they were scared about the effects of global warming, London's Daily Telegraph reported.

Police went to the family's modest house in the city of Goya, in north-eastern Argentina, after neighbours reported a foul smell coming from the home, the Latin American Herald Tribune reported.

Investigators found Mr Lotero and Ms Coletti dead, each with a single shot to the chest, and the couple's two-year-old son, who had been shot in the back.

They found the seven-month-old baby girl in the next room, covered in blood from a bullet wound to her chest.

She was still alive and was taken to hospital, where her condition is improving, the Latin American Herald Tribune reported.