We need clean keyword lists in english language with strong keywords (a lot of results in search engines); this work should be done by native speakers (perhaos with some experiences with topic "sustainable energy".
These lists should contain round about 100-200 keywords per category
1) overall keywords for overview as e.g.
management, Architecture, Construction, Consulting, consulters, design, desinging, agencies, education, financial, services, development, ingenieers, recycling, services, components, ...
(no topic related keywords - round about 200 keywords)
2) keywords for each main topic, as:
solar heating (solar thermal)
water power (tidal energy)
energy saving (private)
energy saving (construction, buildings)
recycling (waste management)
alternative vehicles (cars, boats, motorcycle, watercraft...)
heating, ventilation, air conditioning and refrigeration [abbr.: HVACR]
(18 categories = 18 * 100 keywords = 1.800 different keywords; those keywords must not be based on each other as e.g. solar heating, solar heating products, solar heating offers!)
So we need 2.000 keywords all in all!