The '''Global warming''' theory asserts that recent subtle increases in near-surface air temperature are mostly due to human activity. Supporters and opponents of the theory are polarized on ideological and political lines, with conservatives generally accepting the science and most liberals dismissing or distorting it. | The '''Global warming''' theory asserts that recent subtle increases in near-surface air temperature are mostly due to human activity. Supporters and opponents of the theory are polarized on ideological and political lines, with conservatives generally accepting the science and most liberals dismissing or distorting it. |