Canada

First of all, I said they're not decreasing their capita anymore. That means they're no longer limiting population growth.

https://www.reuters.com/world/china/china-formulate-policies-elderly-focus-boosting-birth-rates-2025-03-05/

Much of China's demographic downturn is the result of its one-child policy imposed between 1980 and 2015. Couples have been allowed to have up to three children since 2021.

However a rising number of young Chinese are opting to not have children, put off by the high cost of childcare or an unwillingness to marry or put their careers on hold, while gender discrimination persists.

Authorities have tried to roll out incentives and measures to encourage couples to have babies, including expanding maternity leave, financial and tax benefits for having children as well as housing subsidies.

But China is one of the world's most expensive places to bring up a child, relative to its GDP per capita, a prominent Chinese think tank said last year, detailing the time and opportunity cost for women who give birth.

Secondly, also yes

https://www.iea.org/reports/co2-emissions-in-2023/energy-intensive-economic-growth-compounded-by-unfavourable-weather-pushed-emissions-up-in-china-and-india

China’s CO2 emissions grew 565 Mt in 2023 to reach 12.6 Gt. This represents an increase of 4.7%, as emissions from energy combustion increased 5.2% while those from industrial processes stayed broadly stable. This occurred despite China’s overwhelming lead in the global clean energy economy. In 2023, China contributed around 60% of the global additions of solar PV, wind power and electric vehicles. From 4% in 2015, the share of solar PV and wind in total electricity generation reached 15% in 2023, close to the level of advanced economies (17%). China’s share of EVs in total car sales was more than double the level of advanced economies in 2023.

However, the growth in clean energy was not sufficient to keep pace with surging energy demand, which increased by around 6.1%

China emits the most out of anywhere and is only set to continue increasing, unless they get overtaken by India as number 1.