this problem KYOTO protocol was signed. Unfortunately United States are among the several countries that do not accept the terms suggested by the protocol, which states for the decrease of release of CO2 emission into the atmosphere, in spite of the fact that United States are the second highest polluters
and release approximately 6000 metric tons of carbon dioxide per year.
Obviously this fact is due to industrial development level of the country as if economically it is unfavorable for United States to sign that protocol. That is why commerce negatively affects and prevents the admission