Since 1958, carbon dioxide concentrations in the air have increased 25%, mostly from oil and coal burning (45% of carbon dioxide comes from the United States and the former Soviet Union).
(carbon dioxide concentrations in the air; have increased; 25%; mostly from oil and coal; T:Since 1958) (carbon dioxide concentrations in the air; burning; )
carbon dioxide concentrations in the air carbon dioxide concentrations in the air
have increased burning
25% mostly from oil and coal T:Since 1958