You know that you actually have to attribute a lot of environmental woes to the population increase. I suppose if older generations had never made you and some of the newer generation, you'd have less to complain about.
Same thing when you consider that payments into government treasuries are back loaded, but the promises made to an expanding population are extremely front loaded - because that's what liberals/progressives demanded. Want more a more fiscally responsible government - demand less. Want less military spending? So did everybody before WW1 and WW2 - maybe stronger militaries would have made some belligerents think differently. Would war with the USSR have been cheaper than the way the cold war played out? Likely the casualties wouldn't have thought so.
Check the population figures - somebody's generations - not mine - increased the US population from about 235M in 1980 to 335M today. Figure out how to increase infrastructure and "entitlement" demands to go with almost a 50% increase in people without impacting something.
Since you want to bring in the environment, the US is a real laggard in population growth when compared to a lot of countries - which are becoming more power hungry just through development alone. Every country on earth adds waste to the environment, and many like China are far less responsible in how they do it.