Some countries are huge produces or investors in fossil fuel. Larger developed countries who are large polluters are therefore reluctant to change their ways. This is why China and other countries that are still expanding rapidly are building more power plants and polluting a lot. Even if these countries try to change their ways, there will be a huge outcry by the population over higher energy cost and resulting inflation that may arise.
This is the main problem affecting the move to carbon neutrality, as technology, though still improving, is at the level where some cities and countries can be carbon neutral. However, people must be made aware of why it is important to become carbon neural and be motivated to support, sacrifice and advocate for the cause.
In conclusion, reaching a state of carbon neutrality will be difficult, but not impossible. It must largely be a people lead strategy, where public opinion will compel governments to alter and create policy, and businesses to offer more environmentally friendly solutions. Governments listen to the people, and businesses listen to their consumer. By successfully giving both an incentive to develop/support more environmentally friendly approach, then carbon neutrality may be a little more achievable.