Final answer:
Robert Solo did not specify a maximum amount of resources current generations can consume but highlighted the importance of sustainability and the need for a transition to renewable resources to ensure long-term survival of human civilization.
Step-by-step explanation:
According to Robert Solo, there is not a defined maximum amount of resources that the current generation can consume without compromising the ability of future generations to meet their needs. The key point of Solo's assertion is sustainability. The consumption of resources must be balanced with the planet's ability to replenish them. Solo emphasizes the necessity for humanity to transition from reliance on finite resources to sustainable sources, akin to living off of an 'annual income' provided by Earth's renewable flows, rather than depleting our 'one-time inheritance' of finite resources. This balance is critical if human civilization is to sustain itself for the long term. It is an open question, however, whether humanity can adapt its technological society to live within planetary limits.