World:
from Proto-Germanic *weraldi-, a compound of *wer “man” (Old English wer, still in werewolf; see virile) + *ald “age” (from PIE root *al- (2) “to grow, nourish”).
Rainforest:
apparently a loan-translation of German Regenwald, coined by A.F.W. Schimper for his 1898 work "Pflanzengeographie
Day:
Old English dæg “period during which the sun is above the horizon,” also “lifetime, definite time of existence,” from Proto-Germanic *dages- “day” (source also of Old Saxon, Middle Dutch, Dutch dag, Old Frisian di, dei, Old High German tag, German Tag, Old Norse dagr, Gothic dags), according to Watkins, from PIE root *agh- “a day.” He adds that the Germanic initial d- is “of obscure origin.” But Boutkan says it is from PIE root *dhegh- “to burn” (see fever). Not considered to be related to Latin dies (which is from PIE root *dyeu- “to shine”).
World Rainforest Day
World: from Proto-Germanic *weraldi-, a compound of *wer “man” (Old English wer, still in werewolf; see virile) + *ald “age” (from PIE root *al- (2) “to grow, nourish”).
Rainforest: apparently a loan-translation of German Regenwald, coined by A.F.W. Schimper for his 1898 work "Pflanzengeographie
Day: Old English dæg “period during which the sun is above the horizon,” also “lifetime, definite time of existence,” from Proto-Germanic *dages- “day” (source also of Old Saxon, Middle Dutch, Dutch dag, Old Frisian di, dei, Old High German tag, German Tag, Old Norse dagr, Gothic dags), according to Watkins, from PIE root *agh- “a day.” He adds that the Germanic initial d- is “of obscure origin.” But Boutkan says it is from PIE root *dhegh- “to burn” (see fever). Not considered to be related to Latin dies (which is from PIE root *dyeu- “to shine”).
Australia has unique temperate rainforests in that they have the biome but not the high rainfall. Like in the Dandenongs, Macedons and the Otways.
In terms of tourism probably one of the few legitimate sights of interest.
You may be interested in this book if you don’t already have it. https://www.routledge.com/Old-English-and-its-Closest-Relatives-A-Survey-of-the-Earliest-Germanic-Languages/Robinson/p/book/9780415104067