There is no need to express opinions when we have good estimates for both your questions:
Sector by sector: where do global greenhouse gas emissions come from? -> https://ourworldindata.org/ghg-emissions-by-sector
individual solutions reviewed and assessed by Project Drawdown, including their relevant sector(s) and their impact on reducing heat-trapping gases -> https://drawdown.org/solutions/table-of-solutions
Both the links above are from a very interesting video on the topic that I suggest to take a look at. Also the whole channel is really interesting and well done -> https://www.youtube.com/watch?v=ReXaS4QausQ
I cannot read the article, but a part of me wishes that the USA forces Europe to become more indipendent.
Huawei was cut off with all the tariffs and was hit hard, but now they came back stronger than before, and this time around USA cannot hit them anymore:
https://www.youtube.com/watch?v=NMFdYFmeiBA