This link shows the commitment that was reached by the United Nations in 1998.
The most interesting paragraph lists the main greenhouse effect gases. This list provides a starting point, which was the objective of those countries that took the initiative in the conference. They were conscious of the confrontation that the agreement would create in terms of economic interests, and it was essential to be specific.
Once the enemy was defined, it would be easier to identify its origins, so that, revoking to some privileges, the world would continue livable for many years to come.
However, nowadays, there isn’t enough concern of the size of the problem, and we continue ignoring the nature’s warnings. As long as we maintain our emissions, I’m sure future generations will have to pay our bill to Earth.
The graph below shows the situation when the protocol was signed. Was the protocol too late? Anyway, it is clear that great harm has already been done.
To conclude, the protocol pointed out the greatest challenges we should face. Here is the list, copied from the original document:
Manufacturing industries and construction
Fugitive emissions from fuels
Oil and natural gas
Production of halocarbons and sulphur hexafluoride
Consumption of halocarbons and sulphur hexafluoride
Prescribed burning of savannas
Field burning of agricultural residues
Solid waste disposal on land