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.
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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