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Originally Posted by Trex
No argument, but it's not an Either/Or choice.
There are a range of options. Any carbon-based fuel will pollute, but some less than others, especially when the engine system is properly designed and maintained. At the far end is perhaps solar power, but as you have noted, even that cannot be totally eco-friendly because one needs to make the gizmos to capture and transmit that power.
I think the point is to minimize that impact to the greatest extent practical. Using your own example, we no longer walk out into the yard to relieve ourselves; we have gone to considerable trouble to produce a system to deal with that biowaste.
Because we cannot do everything does not mean that we should not do anything.
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What our aim is that, if we can make the overall release of CO2 by all human and animal activities < the overall absorption of CO2 by green plant, algae..., we are successful.
Sonar power, of course, the panels used to capture light still needs energy to produce, yet, the CO2 released during its manufacture < the CO2 saved by using it as alternative to fossil fuel. So, the NET CO2 release is NEGATIVE and it is considered green.