Global warming is gauged by the incrementation in the average ecumenical temperature of the Earth. Along with our currently incrementing average ecumenical temperature, some components of the Earth may authentically get more gelid while other components get warmer—hence the conception of average ecumenical temperature. Greenhouse gas-caused atmospheric heating and agitation withal increase the capriciousness of the weather and climate, and dramatically increase the rigor, scale, and frequency of inclemencies, droughts, wildfires, and extreme temperatures.
Ecumenical warming can reach levels of irreversibility, and incrementing levels of ecumenical warming can ineluctably reach an extinction level where humanity and all life on earth will culminate. In this book, irreversible ecumenical warming is defined as a continuum of incrementing temperature that causes the ecumenical climate to expeditiously change until those higher temperatures becomes irreversible on practical human time scales. The eventual temperature range associated with triggering and marking the commencement of the irreversible ecumenical warming processes is an incrementation in average ecumenical temperature of 2.2°-4° Celsius (4°-7.2° Fahrenheit) above preindustrial levels.
Extinction level ecumenical warming is defined in this book as temperatures exceeding preindustrial levels by 5-6° Celsius (9-10.8° Fahrenheit) or the extinction of all planetary life, or the eventual loss of our atmosphere. If our atmosphere is withal lost, this is referred to as runaway ecumenical warming. The result would be akin to what is thought to have transpired to Venus 4 billion years ago, resulting in a carbon-opulent atmosphere and minimum surface temperatures of 462 °C. The temperature levels described above for irreversible and extinction level ecumenical warming are not hard and rigid boundaries, but boundary ranges that describe the cognate consequences and their intensities within a certain level of ecumenical warming. These temperature boundary levels may be modified by future research. More about irreversible ecumenical warming and extinction-level ecumenical warming can come about because of involute interactions that will be expounded plenarily in Chapter 4. Chapter 4 and Chapter 5 will set the substratum indispensable to understand how we are already engendering the conditions that will precipitate irreversible and extinction-level ecumenical warming if we keep going as we are now.
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