Solar Impulse is not a product, it's a hack.
Electric cars carbon footprint will eventually decrease with massive adoption.
Petrol sucks. doesn't scale.
EDIT: And yes, it's true that selling something as a ecological when it isn't, is bad. But at least it's a small step in the right direction.
No, we shouldn't. But we often advertise non-green products as green solutions, and that's terrible because it disrupts people's understanding of global climate change. People believe the electric car is green, whereas its carbon footprint is sensibly equal to the petrol-based car if you include the electricity/petrol lifecycle. People dodge the idea that the carbon footprint will always be further reduced by carpooling/public transports/not moving across the Earth every week, rather than by saving 5% or 10% of the petrol.
Yes, we should advertise about ecology. No we shouldn't advertise anti-ecologist products. If you read between the lines, that's what the author is demonstrating.