Enough food is produced in the world to feed all of its 8 billion people, yet 1 in 11 go hungry every day and 300,000,000 people in 53 countries risk starving to death immediately (2025 Global Report of Food Crises).
Although climate change affects regional food production, war (currently involving 38 countries) has a far greater effect by disrupting infrastructure, displacing populations and destabilising economies ... preventing so many people receiving enough food. Christians are rightly concerned.