Original v Guardianu:

Planting billions of trees across

Finance:

Gre za bilijon novih dreves, ki bi zavzela površino ZDA in Kitajske.

Cambridge dictionary, dictionary.cambridge...h/billion:

billion
noun [ C ]
uk ​ /ˈbɪl.jən/ us ​ /ˈbɪl.jən/

the number 1,000,000,000
-The population of China is over a/one billion.
-Cosmetics is a billion-dollar industry.
-The government has invested billions of dollars in the project.

UK old-fashioned 1,000,000,000,000
Note:
This number is now called a trillion.

informal a very large number:

billions of sth

-there were billions of flies everywhere.

Torej dragi Financarji, ali govorimo o 1000 miljonih, miljon miljonih, ali na splošno o velikem številu, kar je edino smiselno razumljivo upoštevaje Cambridgevo definicijo besede bilijon?

v originalu je a trillion trees

... a trillion trees, covering in total an area as large as the US and China combined..