Abstract: Research on 100% renewable energy systems is a relatively recent phenomenon. It was initiated in the mid-1970s, catalyzed by skyrocketing oil prices. Since the mid-2000s, it has quickly ...
The United States is implementing a new “America-first” entry fee policy that will charge non-US residents without an annual pass $100 per person at its 11 most-visited national parks. The change was ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results