Shipping’s carbon emissions climbed by 23 million tons in the first half of this year, partly as vessels took longer routes to avoid attacks in the Red Sea.

DUBAI, United Arab Emirates — Two suspected attacks by Yemen’s Houthi rebels targeted ships in the Red Sea on July 15, as a new U.S. aircraft carrier approached the region to provide security.

Attacks by Iran-backed Houthi militants on the Red Sea have reinvigorated piracy networks in Somalia, with criminal groups growing in both number and force, a European naval commander said.

A gauge of global sea transport is heading for its biggest annual jump since 2010 after attacks in the Red Sea have forced ships to travel longer distances.

A.P. Moller-Maersk, a bellwether for global trade, said the world’s supply lines are more impacted than previously expected by the ripple effects coming from the congestion in the Red Sea.

Nearly six months into the Houthis’ relentless campaign to protest Israel’s war in Gaza, the economic fallout is widening.

The Houthi group based in Yemen threatened to start trying to attack ships in the eastern Mediterranean as it steps up a campaign of anti-Israeli assaults.

JERUSALEM — A containership came under attack by a drone in the far reaches of the Arabian Sea, corresponding with a claim by Yemen’s Houthi rebels that they assaulted the ship there.

For all the costly hardware the U.S. and its allies have thrown at the Houthis from Yemen, they haven’t been able to stop the attacks on civilian freighters and warships in the Red Sea.