China is the biggest polluter in the world. Under this agreement China can increase there emissions all they want until 2030, then they're supposed to start decreasing them thereafter. However there's absolutely nothing to hold them accountable to that, so they can just do whatever they want. Same thing with India
Hell under this agreement absolutely nobody can be held to anything. But the United States being the United States would at least to attempt to do their part, while most of the other countries do whatever the freak they want.
If it was a concrete agreement with specifications that's a whole different game. But this has different standards for different parties, with no concrete anything
China amounts for the most emissions, but on a per capita basis, the U.S. is far an away the biggest offender. China and India do not have any specific deadlines until 2030, but they have set a goal to reach at 2030. Meaning, they have to make strides to reach that goal in the meantime. They can't just keep increasing emissions with no regard, then 2029 rolls around and meet their goal. China pledged to have a 20% increase in non-fossil fuel use, which cannot happen overnight, as well as reduce carbon reliance by 60-65% from 2005 numbers. India has pledged to reduce emissions by 2030 by 33-35%. Once again, this cannot happen overnight and must (and will) be something that have to start working towards now.
... As of now, China and India have both started to work towards their goals, and are apparently ahead of projected schedule.