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Deprecated function: Return type of DatabaseStatementBase::execute($args = [], $options = []) should either be compatible with PDOStatement::execute(?array $params = null): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in require_once() (line 2244 of /mnt/www/html/mgrieblertest/docroot/includes/database/database.inc).

Deprecated function: Return type of DatabaseStatementEmpty::current() should either be compatible with Iterator::current(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in require_once() (line 2346 of /mnt/www/html/mgrieblertest/docroot/includes/database/database.inc).

Deprecated function: Return type of DatabaseStatementEmpty::next() should either be compatible with Iterator::next(): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in require_once() (line 2346 of /mnt/www/html/mgrieblertest/docroot/includes/database/database.inc).

Deprecated function: Return type of DatabaseStatementEmpty::key() should either be compatible with Iterator::key(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in require_once() (line 2346 of /mnt/www/html/mgrieblertest/docroot/includes/database/database.inc).

Deprecated function: Return type of DatabaseStatementEmpty::valid() should either be compatible with Iterator::valid(): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in require_once() (line 2346 of /mnt/www/html/mgrieblertest/docroot/includes/database/database.inc).

Deprecated function: Return type of DatabaseStatementEmpty::rewind() should either be compatible with Iterator::rewind(): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in require_once() (line 2346 of /mnt/www/html/mgrieblertest/docroot/includes/database/database.inc).

Deprecated function: Return type of DatabaseCondition::count() should either be compatible with Countable::count(): int, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in require_once() (line 1652 of /mnt/www/html/mgrieblertest/docroot/includes/database/query.inc).

Deprecated function: Creation of dynamic property MergeQuery::$condition is deprecated in MergeQuery->__construct() (line 1344 of /mnt/www/html/mgrieblertest/docroot/includes/database/query.inc).

Deprecated function: Creation of dynamic property DatabaseCondition::$stringVersion is deprecated in DatabaseCondition->compile() (line 1865 of /mnt/www/html/mgrieblertest/docroot/includes/database/query.inc).

rainforests

How many tree species are found in the world's rainforests?

Estimated number of tropical tree species according to Slik et al. (2015)

Rhett A. Butler

The world's tropical rainforests are likely home to 40,000 to 53,000 tree species, argues a paper published this week in Proceedings of the National Academy of Sciences (PNAS).

Read more about How many tree species are found in the world's rainforests?

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