The phrase "optimistic scenario" refers to a situation or outcome that is positive or favorable. It suggests that things will work out well or go as smoothly as one hopes. Full definition
Even under the most optimistic scenario of a 1.5 °C temperature increase, the authors estimate that the flood - affected population would still double, and flood damages would increase by 120 %. (helixclimate.eu)
The more optimistic scenario gives the prospects for growth, assuming that new markets, such as education and business reading applications see significant uptake in the next few years. (printedelectronicsworld.com)
This assumption is unlikely but allows us to create very optimistic scenarios that demonstrate how high expectations in the current valuation are. (newconstructs.com)