die Menschheit
humanity
All people on Earth, considered as one unit.
Der Klimawandel ist eine der größten Herausforderungen für die gesamte Menschheit.
Climate change is one of the greatest challenges for all of humanity.

humanity
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humanity
All people on Earth, considered as one unit.
Der Klimawandel ist eine der größten Herausforderungen für die gesamte Menschheit.
Climate change is one of the greatest challenges for all of humanity.

The word consists of 'Mensch' (human/person) and the suffix '-heit'. The ending '-heit' forms feminine nouns that describe a totality or a state; here, therefore, the totality of all humans.
Die Erfindung des Rades war ein großer Schritt für die Menschheit.
The invention of the wheel was a great step for humanity.
'Menschheit' (humanity) is understood as a collective term and is used almost exclusively in the singular. It describes all people as a single group.
Krankheiten kennen keine Grenzen und bedrohen die gesamte Menschheit.
Diseases know no borders and threaten all of humanity.
The word is often used in large, global, or philosophical contexts. Typical expressions are 'die Geschichte der Menschheit' (the history of humanity) or 'die Zukunft der Menschheit' (the future of humanity).
Das Museum zeigt die Geschichte der Menschheit von den Anfängen bis heute.
The museum shows the history of humanity from its beginnings to the present day.
human / person
'der Mensch' and 'die Menschheit' can both mean all people together. In this meaning, 'der Mensch' often appears in the singular and sounds like a general statement about our species. 'die Menschheit' clearly means all human beings on Earth as a whole. Learners may confuse the words because both fit in sentences about history, the future, or the environment. 'die Menschheit' is more unambiguous when you really mean all people as one large group. 'der Mensch' sounds more natural when speaking generally about typical abilities or behavior.

In Zukunft muss die Menschheit besser mit Wasser und Energie umgehen.
In the future, humanity must handle water and energy better.
Der Mensch lernt seit langer Zeit, Werkzeuge zu benutzen.
Humankind has been learning to use tools for a long time.