Mandatory Credit: Photo by Koall Carsten/action press/REX/Shutterstock (9720014i) Angela Merkel, Mateusz Morawiecki Petersberg Climate Dialogue Convenes, Berlin, Germany - 19 Jun 2018

Mandatory Credit: Photo by Koall Carsten/action press/REX/Shutterstock (9720014o) Angela Merkel, Mateusz Morawiecki Petersberg Climate Dialogue Convenes, Berlin, Germany - 19 Jun 2018

Mandatory Credit: Photo by Koall Carsten/action press/REX/Shutterstock (9720014p) Angela Merkel, Mateusz Morawiecki Petersberg Climate Dialogue Convenes, Berlin, Germany - 19 Jun 2018

Mandatory Credit: Photo by Koall Carsten/action press/REX/Shutterstock (9720014q) Angela Merkel, Mateusz Morawiecki Petersberg Climate Dialogue Convenes, Berlin, Germany - 19 Jun 2018

Mandatory Credit: Photo by Koall Carsten/action press/REX/Shutterstock (9720014r) Angela Merkel, Mateusz Morawiecki Petersberg Climate Dialogue Convenes, Berlin, Germany - 19 Jun 2018

From left, German Environment, Nature Conservation and Nuclear Safety Minister Svenja Schulze, German Chancellor Angela Merkel and Polish Prime Minister Mateusz Morawiecki and Michał Kurtyka, designated President of the 24th World Climate Conference, arrive for a preparatory meeting for a climate change conference that takes place later this year in Poland's city Katowice, in Berlin, Tuesday, June 19, 2018. (AP Photo/Markus Schreiber)

German Chancellor Angela Merkel, left, and Polish Prime Minister Mateusz Morawiecki attend a preparatory meeting for a climate change conference that takes place later this in year Poland's city Katowice, in Berlin, Tuesday, June 19, 2018. (AP Photo/Markus Schreiber, Pool)

(L-R) German Environment Minister Svenja Schulze, German Chancellor Angela Merkel and Polish Prime Minister Mateusz Morawiecki pose during the 9th Petersberg Climate Dialogue meeting on June 19, 2018 in Berlin. Germany hosts annual Petersberg Climate Dialogue, an informal meeting with ministers and other representatives from 35 countries. / AFP PHOTO / Tobias SCHWARZ

(L-R) German Environment Minister Svenja Schulze, German Chancellor Angela Merkel and Polish Prime Minister Mateusz Morawiecki pose during the 9th Petersberg Climate Dialogue meeting on June 19, 2018 in Berlin. Germany hosts annual Petersberg Climate Dialogue, an informal meeting with ministers and other representatives from 35 countries. / AFP PHOTO / Tobias SCHWARZ

BERLIN, GERMANY - JUNE 19: German Chancellor Angela Merkel (2nd L) welcomes Prime Minister of Poland Mateusz Morawiecki (2nd R) within the Petersberg Climate Dialogue in Berlin, Germany on June 19, 2018. Abdulhamid Hosbas / Anadolu Agency

BERLIN, GERMANY - JUNE 19: German Chancellor Angela Merkel (2nd L) welcomes Prime Minister of Poland Mateusz Morawiecki (2nd R) within the Petersberg Climate Dialogue in Berlin, Germany on June 19, 2018. Abdulhamid Hosbas / Anadolu Agency

BERLIN, GERMANY - JUNE 19: German Chancellor Angela Merkel (L) welcomes Prime Minister of Poland Mateusz Morawiecki (R) within the Petersberg Climate Dialogue in Berlin, Germany on June 19, 2018. Abdulhamid Hosbas / Anadolu Agency

BERLIN, GERMANY - JUNE 19: German Chancellor Angela Merkel (L) welcomes Prime Minister of Poland Mateusz Morawiecki (R) within the Petersberg Climate Dialogue in Berlin, Germany on June 19, 2018. Abdulhamid Hosbas / Anadolu Agency

BERLIN, GERMANY - JUNE 19: German Chancellor Angela Merkel (2nd L) welcomes Prime Minister of Poland Mateusz Morawiecki (2nd R) within the Petersberg Climate Dialogue in Berlin, Germany on June 19, 2018. Abdulhamid Hosbas / Anadolu Agency

BERLIN, GERMANY - JUNE 19: German Chancellor Angela Merkel (L) welcomes Prime Minister of Poland Mateusz Morawiecki (R) within the Petersberg Climate Dialogue in Berlin, Germany on June 19, 2018. Abdulhamid Hosbas / Anadolu Agency

Mandatory Credit: Photo by Koall Carsten/action press/REX/Shutterstock (9720014j) Mateusz Morawiecki Petersberg Climate Dialogue Convenes, Berlin, Germany - 19 Jun 2018

Mandatory Credit: Photo by Koall Carsten/action press/REX/Shutterstock (9720014k) Mateusz Morawiecki Petersberg Climate Dialogue Convenes, Berlin, Germany - 19 Jun 2018

Mandatory Credit: Photo by Koall Carsten/action press/REX/Shutterstock (9720014l) Mateusz Morawiecki Petersberg Climate Dialogue Convenes, Berlin, Germany - 19 Jun 2018

Mandatory Credit: Photo by Koall Carsten/action press/REX/Shutterstock (9720014m) Mateusz Morawiecki Petersberg Climate Dialogue Convenes, Berlin, Germany - 19 Jun 2018

Polish Prime Minister Mateusz Morawiecki delivers his speech at a meeting in Berlin, Tuesday, June 19, 2018, which prepares a climate change conference that takes place later this year in Poland's city Katowice. (AP Photo/Markus Schreiber, Pool)

German Chancellor Angela Merkel, right, and German Environment, Nature Conservation and Nuclear Safety Minister Svenja Schulze, second from right, listen to Polish Prime Minister Mateusz Morawiecki, left, at a meeting in Berlin, Tuesday, June 19, 2018, which prepares a climate change conference that takes place later this year in Poland's city Katowice. (AP Photo/Markus Schreiber, Pool)

Polish Prime Minister Mateusz Morawiecki delivers his speech as German Chancellor Angela Merkel (R) and German Environment Minister Svenja Schulze (C) listen at a preparatory meeting for a climate change conference that takes place later this in year Poland's city of Katowice, in Berlin, on June 19, 2018. Germany hosts annual Petersberg Climate Dialogue, an informal meeting with ministers and other representatives from 35 countries. / AFP PHOTO / POOL / Markus Schreiber