  The level of technological development of any civilization can be gaged in
large part by the amount of energy they produce for their use, but also
encompasses that civilization's stewardship of their home world. Following the
Kardashev definition, a Type I civilization is able to store and use all the
energy available on its planet. In this study, we develop a model based on Carl
Sagan's K formula and use this model to analyze the consumption and energy
supply of the three most important energy sources: fossil fuels (e.g., coal,
oil, natural gas, crude, NGL and feedstocks), nuclear energy and renewable
energy. We also consider environmental limitations suggested by United Nations
Framework Convention on Climate Change, the International Energy Agency, and
those specific to our calculations to predict when humanity will reach the
level of a Kardashev scale Type I civilization. Our findings suggest that the
best estimate for this day will not come until year 2371.
