In both cases the goal should be to reduce the amount. Less ICE engines and less consumption of beef. Impossible and Beyond plant based meat is very close to ground beef and largely satisfies. Electric cars will work for 90% of people in the near future. There will always be exceptions. Sometimes you need an ICE vehicle for a specific application and sometimes people will want a good steak or burger. That is okay. Reducing both by 50% would be a huge step in the right direction and would require little sacrifice.