We could possibly streamline our processes to be about double as efficient as they are now if we had a worldwide dictatorship who's main goal is just that, but then we still wouldn't have room for improving living standards or further increase of population.
It is simply a brute fact that this planet has limited space and limited resources, and exponential growth of anything will come to its limit eventually.
Earth has a landmass of ~150 million square kilometres. About half of that is unusable because it's arctic, desert or mountains. That leaves you with an area of 100 * 1000 metres. A football field is about 100 m in length. You have that space to live on, build roads and factories on, grow your food (including grazing cattle), mine resources, grow timber and dump your trash. With a modest western lifestyle, you need about half of that, so about 500 * 100 m. That leaves the other half to all the critters who also want to live.