This article is about that China fears that if the US turns to protectionism it will have very bad effect and undermine the global economy, it would also harm international efforts to combat global warming.
This article is about protectionist steps that could spark a global trade war have violated that promise, with countries from Russia to the United States to China enacting measures aimed at limiting the flow of imported goods.
This article talks about how protectionist policies in one country can spark retaliatory policies in another, leading to a global trade war and inhibiting free trade.
The main idea of this article is exactly what the title states. China says that the high tariffs on solar panels produced in China "could undermine global economy and harm international efforts to combat global warming". Here, we can see several problems: scarcity and sustainability - the protection towards Chinese solar panels may force countries to use non-renewable sources as energy instead of renewable sources of energy such as the solar system. The article also mentions China's retaliation towards the US, as China would "purchase less American factory equipment and raw materials for making solar panels".