Because the Earth's surface has warmed by about 0.8 ° C since 1900, radiation from the earth's surface (396 W/m²) has increased by about 5 W/m². Absorption from the atmosphere by the surface has increased by about the same amount. The result is a net energy inflow of about 1 W/m², which compared to the energy 0.03 W/m² generated directly by humans, is significant.

**Energy from the sun**

Radiation from the sun | 341 W/m² |

Absorbed by atmosphere | -78 W/m² |

Reflected by clouds and aerosols | -79 W/m² |

Reflected by Earth's surface | -23 W/m² |

Absorbed by Earth's surface | 161 W/m² |

**Energy loss from the Earth's surface**

Radiation from Earth's surface | -396 W/m² |

Convection from surface | -17 W/m² |

Evapotranspiration from surface | -80 W/m² |

Total loss from surface | -493 W/m² |

**Net balance:**

Radiation from sun | 161 W/m² |

Absorbed from atmosphere | 333 W/m² |

Total absorbed by surface | 494 W/m² |

Total lost by surface | 493 W/m² |

Net absorption | 1 W/m² |

Human generated | 0.03 W/m² |

Approximately 161 W/m² of direct solar radiation is absorbed by the Earth's surface. 333 W/m² are absorbed by the Earth's surface from the atmosphere for a total of 494 W/m².

The Earth's surface radiates about 396 W/m². Together with evapotranspiration (80 W/m²) and convection (17 W/m²) the Earth's surface loses 493 W/m².

The net result is an increase in absorption of about 1 W/m².