The concentration of greenhouse gases in the atmosphere is close to 400 mega ppm of the total quota that can be accommodated, which is 1500 mega tons of ppm. If the pattern of development in the world does not change immediately, in the next 14 years, that number will be fulfilled. This was conveyed by Prof. Rizaldi Boer, Permanent Professor, Faculty of Mathematics and Natural Sciences (FMIPA) IPB University at the International Symposium on Ecocity Bogor at Savero Hotel Bogor, (22/3).