exhale about 3 billion tons Slate explains 2 pounds 2 pounds Are you heating the planet when you breathe? - Slate exhale about 3 billion tons exhale about 3 billion tons exhale about 3 billion tons 2 pounds Are you heating the planet when you breathe? - Slate exhale about 3 billion tons exhale about 3 billion tons exhale about 3 billion tons exhale about 3 billion tons exhale about 3 billion tons carbon dioxide exhale about 3 billion tons Are you heating the planet when you breathe? – Slate Are you heating the planet when you breathe? - Slate 2 pounds exhale about 3 billion tons